diff --git a/.travis.yml b/.travis.yml
index c69460b5..4aca423b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,18 +1,28 @@
 language: go
 
-matrix:
-  include:
-    - go: "1.10.x"
-    - go: "1.11.x"
-    - go: "1.12.x"
-    - go: "1.13.x"
+os:
+  - linux
+  - osx
+  - windows
+
+go:
+  - "1.10.x"
+  - "1.11.x"
+  - "1.12.x"
+  - "1.13.x"
 
 install:
   - go get -t ./...
-  - "curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $(go env GOPATH)/bin"
 
-script:
-  - go test -race
-  - golangci-lint run
+before_script:
+  - |
+    if [[ $TRAVIS_GO_VERSION == '1.13.x' && $TRAVIS_OS_NAME == 'linux' ]]; then
+      curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $(go env GOPATH)/bin
+    fi
 
-script: go test -v ./...
+script:
+  - go test -v -race ./...
+  - |
+    if [[ $TRAVIS_GO_VERSION == '1.13.x' && $TRAVIS_OS_NAME == 'linux' ]]; then
+      golangci-lint run
+    fi
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2fd1444e..73c884f4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # CHANGELOG
 
+## 4.0.5
+
+* Ignore errors when syncing file system. These errors were primarily due
+  to the file system not supporting the sync call. Reported by devkappa.
+  GitHub #37.
+* Use CRLF line endings on Windows for text files.
+* Fix tests on Windows.
+
 ## 4.0.4 (2019-08-30)
 
 * Do not try to sync the database directory when running on Windows.
diff --git a/Makefile b/Makefile
index f398383f..99af8c45 100644
--- a/Makefile
+++ b/Makefile
@@ -18,6 +18,10 @@ DATADIR=/usr/local/share/GeoIP
 endif
 endif
 
+ifeq ($(OS),Windows_NT)
+MAYBE_CR=\r
+endif
+
 ifndef VERSION
 VERSION=unknown
 endif
@@ -41,13 +45,13 @@ $(BUILDDIR)/geoipupdate: $(BUILDDIR)
 	cp cmd/geoipupdate/geoipupdate $(BUILDDIR)
 
 $(BUILDDIR)/GeoIP.conf: $(BUILDDIR) conf/GeoIP.conf.default
-	sed -e 's|CONFFILE|$(CONFFILE)|g' -e 's|DATADIR|$(DATADIR)|g' conf/GeoIP.conf.default > $(BUILDDIR)/GeoIP.conf
+	sed -e 's|CONFFILE|$(CONFFILE)|g' -e 's|DATADIR|$(DATADIR)|g' -e 's|$$|$(MAYBE_CR)|g' conf/GeoIP.conf.default > $(BUILDDIR)/GeoIP.conf
 
 $(BUILDDIR)/GeoIP.conf.md: $(BUILDDIR) doc/GeoIP.conf.md
-	sed -e 's|CONFFILE|$(CONFFILE)|g' -e 's|DATADIR|$(DATADIR)|g' doc/GeoIP.conf.md > $(BUILDDIR)/GeoIP.conf.md
+	sed -e 's|CONFFILE|$(CONFFILE)|g' -e 's|DATADIR|$(DATADIR)|g' -e 's|$$|$(MAYBE_CR)|g' doc/GeoIP.conf.md > $(BUILDDIR)/GeoIP.conf.md
 
 $(BUILDDIR)/geoipupdate.md: $(BUILDDIR) doc/geoipupdate.md
-	sed -e 's|CONFFILE|$(CONFFILE)|g' -e 's|DATADIR|$(DATADIR)|g' doc/geoipupdate.md > $(BUILDDIR)/geoipupdate.md
+	sed -e 's|CONFFILE|$(CONFFILE)|g' -e 's|DATADIR|$(DATADIR)|g' -e 's|$$|$(MAYBE_CR)|g' doc/geoipupdate.md > $(BUILDDIR)/geoipupdate.md
 
 $(BUILDDIR)/GeoIP.conf.5: $(BUILDDIR)/GeoIP.conf.md  $(BUILDDIR)/geoipupdate.md
 	dev-bin/make-man-pages.pl "$(BUILDDIR)"
diff --git a/cmd/geoipupdate/config.go b/cmd/geoipupdate/config.go
index 7c9f75b9..00f10279 100644
--- a/cmd/geoipupdate/config.go
+++ b/cmd/geoipupdate/config.go
@@ -74,7 +74,7 @@ func NewConfig( // nolint: gocyclo
 			keysSeen["AccountID"] = struct{}{}
 			keysSeen["UserId"] = struct{}{}
 		case "DatabaseDirectory":
-			config.DatabaseDirectory = value
+			config.DatabaseDirectory = filepath.Clean(value)
 		case "EditionIDs", "ProductIds":
 			config.EditionIDs = strings.Fields(value)
 			keysSeen["EditionIDs"] = struct{}{}
@@ -84,7 +84,7 @@ func NewConfig( // nolint: gocyclo
 		case "LicenseKey":
 			config.LicenseKey = value
 		case "LockFile":
-			config.LockFile = value
+			config.LockFile = filepath.Clean(value)
 		case "PreserveFileTimes":
 			if value != "0" && value != "1" {
 				return nil, errors.New("`PreserveFileTimes' must be 0 or 1")
@@ -132,11 +132,11 @@ func NewConfig( // nolint: gocyclo
 
 	// Argument takes precedence.
 	if databaseDirectory != "" {
-		config.DatabaseDirectory = databaseDirectory
+		config.DatabaseDirectory = filepath.Clean(databaseDirectory)
 	}
 
 	if config.DatabaseDirectory == "" {
-		config.DatabaseDirectory = defaultDatabaseDirectory
+		config.DatabaseDirectory = filepath.Clean(defaultDatabaseDirectory)
 	}
 
 	if host == "" {
diff --git a/cmd/geoipupdate/config_test.go b/cmd/geoipupdate/config_test.go
index 102efbdb..da86b109 100644
--- a/cmd/geoipupdate/config_test.go
+++ b/cmd/geoipupdate/config_test.go
@@ -4,6 +4,7 @@ import (
 	"io/ioutil"
 	"net/url"
 	"os"
+	"path/filepath"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -60,9 +61,9 @@ EditionIDs GeoLite2-Country GeoLite2-City
 # LockFile DATADIR/.geoipupdate.lock
 `,
 			Output: &Config{
-				DatabaseDirectory: "/tmp",
+				DatabaseDirectory: filepath.Clean("/tmp"),
 				EditionIDs:        []string{"GeoLite2-Country", "GeoLite2-City"},
-				LockFile:          "/tmp/.geoipupdate.lock",
+				LockFile:          filepath.Clean("/tmp/.geoipupdate.lock"),
 				URL:               "https://updates.maxmind.com",
 			},
 		},
@@ -109,9 +110,9 @@ ProductIds GeoLite2-Country GeoLite2-City
 # LockFile DATADIR/.geoipupdate.lock
 `,
 			Output: &Config{
-				DatabaseDirectory: "/tmp",
+				DatabaseDirectory: filepath.Clean("/tmp"),
 				EditionIDs:        []string{"GeoLite2-Country", "GeoLite2-City"},
-				LockFile:          "/tmp/.geoipupdate.lock",
+				LockFile:          filepath.Clean("/tmp/.geoipupdate.lock"),
 				URL:               "https://updates.maxmind.com",
 			},
 		},
@@ -159,10 +160,10 @@ LockFile /usr/lock
 `,
 			Output: &Config{
 				AccountID:         1234,
-				DatabaseDirectory: "/tmp", // Argument takes precedence
+				DatabaseDirectory: filepath.Clean("/tmp"), // Argument takes precedence
 				EditionIDs:        []string{"GeoLite2-Country", "GeoLite2-City", "GeoIP2-City"},
 				LicenseKey:        "abcdefghi",
-				LockFile:          "/usr/lock",
+				LockFile:          filepath.Clean("/usr/lock"),
 				Proxy: &url.URL{
 					Scheme: "http",
 					User:   url.UserPassword("username", "password"),
@@ -237,9 +238,9 @@ EditionIDs GeoIP2-City`,
 LicenseKey 000000000000
 EditionIDs GeoIP2-City`,
 			Output: &Config{
-				DatabaseDirectory: "/tmp",
+				DatabaseDirectory: filepath.Clean("/tmp"),
 				EditionIDs:        []string{"GeoIP2-City"},
-				LockFile:          "/tmp/.geoipupdate.lock",
+				LockFile:          filepath.Clean("/tmp/.geoipupdate.lock"),
 				URL:               "https://updates.maxmind.com",
 			},
 		},
@@ -249,9 +250,9 @@ EditionIDs GeoIP2-City`,
 LicenseKey 000000000000
 EditionIDs GeoIP2-City`,
 			Output: &Config{
-				DatabaseDirectory: "/tmp",
+				DatabaseDirectory: filepath.Clean("/tmp"),
 				EditionIDs:        []string{"GeoIP2-City"},
-				LockFile:          "/tmp/.geoipupdate.lock",
+				LockFile:          filepath.Clean("/tmp/.geoipupdate.lock"),
 				URL:               "https://updates.maxmind.com",
 			},
 		},
@@ -262,10 +263,10 @@ LicenseKey abcd
 EditionIDs GeoIP2-City`,
 			Output: &Config{
 				AccountID:         999999,
-				DatabaseDirectory: "/tmp",
+				DatabaseDirectory: filepath.Clean("/tmp"),
 				EditionIDs:        []string{"GeoIP2-City"},
 				LicenseKey:        "abcd",
-				LockFile:          "/tmp/.geoipupdate.lock",
+				LockFile:          filepath.Clean("/tmp/.geoipupdate.lock"),
 				URL:               "https://updates.maxmind.com",
 			},
 		},
@@ -280,10 +281,10 @@ SkipPeerVerification 1
 `,
 			Output: &Config{
 				AccountID:         123,
-				DatabaseDirectory: "/tmp",
+				DatabaseDirectory: filepath.Clean("/tmp"),
 				EditionIDs:        []string{"GeoIP2-City"},
 				LicenseKey:        "abcd",
-				LockFile:          "/tmp/.geoipupdate.lock",
+				LockFile:          filepath.Clean("/tmp/.geoipupdate.lock"),
 				URL:               "https://updates.maxmind.com",
 			},
 		},
@@ -292,10 +293,10 @@ SkipPeerVerification 1
 			Input:       "AccountID 123\r\nLicenseKey 123\r\nEditionIDs GeoIP2-City\r\n",
 			Output: &Config{
 				AccountID:         123,
-				DatabaseDirectory: "/tmp",
+				DatabaseDirectory: filepath.Clean("/tmp"),
 				EditionIDs:        []string{"GeoIP2-City"},
 				LicenseKey:        "123",
-				LockFile:          "/tmp/.geoipupdate.lock",
+				LockFile:          filepath.Clean("/tmp/.geoipupdate.lock"),
 				URL:               "https://updates.maxmind.com",
 			},
 		},
@@ -312,10 +313,10 @@ EditionIDs    GeoLite2-City      GeoLite2-Country
 `,
 			Output: &Config{
 				AccountID:         123,
-				DatabaseDirectory: "/tmp",
+				DatabaseDirectory: filepath.Clean("/tmp"),
 				EditionIDs:        []string{"GeoLite2-City", "GeoLite2-Country"},
 				LicenseKey:        "456",
-				LockFile:          "/tmp/.geoipupdate.lock",
+				LockFile:          filepath.Clean("/tmp/.geoipupdate.lock"),
 				URL:               "https://updates.maxmind.com",
 			},
 		},
@@ -324,10 +325,10 @@ EditionIDs    GeoLite2-City      GeoLite2-Country
 			Input:       "AccountID\t123\nLicenseKey\t\t456\nEditionIDs\t\t\tGeoLite2-City\t\t\t\tGeoLite2-Country\t\t\t\t\n",
 			Output: &Config{
 				AccountID:         123,
-				DatabaseDirectory: "/tmp",
+				DatabaseDirectory: filepath.Clean("/tmp"),
 				EditionIDs:        []string{"GeoLite2-City", "GeoLite2-Country"},
 				LicenseKey:        "456",
-				LockFile:          "/tmp/.geoipupdate.lock",
+				LockFile:          filepath.Clean("/tmp/.geoipupdate.lock"),
 				URL:               "https://updates.maxmind.com",
 			},
 		},
diff --git a/cmd/geoipupdate/main_test.go b/cmd/geoipupdate/main_test.go
index a220a4a4..fe120e8e 100644
--- a/cmd/geoipupdate/main_test.go
+++ b/cmd/geoipupdate/main_test.go
@@ -131,7 +131,7 @@ func TestUpdateEdition(t *testing.T) {
 			FilenameBody:   "GeoIP2-City.mmdb",
 			DownloadStatus: http.StatusOK,
 			DownloadBody:   "new database goes here",
-			Err:            `error updating: error creating file: open \S+GeoIP2-City\.mmdb\.test: no such file or directory`,
+			Err:            `error updating: error creating file: open \S+GeoIP2-City\.mmdb\.test: (?:no such file or directory|The system cannot find the path specified)`,
 		},
 		{
 			Description:     "Download fails because provided checksum does not match",