diff --git a/serial_darwin.go b/serial_darwin.go
index 2398ea5..a87458e 100644
--- a/serial_darwin.go
+++ b/serial_darwin.go
@@ -14,7 +14,7 @@ import (
 
 const devFolder = "/dev"
 
-var osPortFiler = regexp.MustCompile("^(cu|tty)\\..*")
+var osPortFilter = regexp.MustCompile("^(cu|tty)\\..*")
 
 const ioctlTcgetattr = unix.TIOCGETA
 const ioctlTcsetattr = unix.TIOCSETA
diff --git a/serial_freebsd.go b/serial_freebsd.go
index 591dc4b..775b7a6 100644
--- a/serial_freebsd.go
+++ b/serial_freebsd.go
@@ -14,7 +14,7 @@ import (
 
 const devFolder = "/dev"
 
-var osPortFiler = regexp.MustCompile("^(cu|tty)\\..*")
+var osPortFilter = regexp.MustCompile("^(cu|tty)\\..*")
 
 // termios manipulation functions
 
diff --git a/serial_openbsd.go b/serial_openbsd.go
index 3b396c1..ad5efd0 100644
--- a/serial_openbsd.go
+++ b/serial_openbsd.go
@@ -14,7 +14,7 @@ import (
 
 const devFolder = "/dev"
 
-var osPortFiler = regexp.MustCompile("^(cu|tty)\\..*")
+var osPortFilter = regexp.MustCompile("^(cu|tty)\\..*")
 
 // termios manipulation functions