diff --git a/.github/workflows/deploy-book.yml b/.github/workflows/deploy-book.yml
index 4759495e9..f4e1b6ddc 100644
--- a/.github/workflows/deploy-book.yml
+++ b/.github/workflows/deploy-book.yml
@@ -43,7 +43,7 @@ jobs:
       - name: Populate sample version of Crystal
         run: crystal --version | tee crystal-version.txt
       - name: Build book
-        run: LINT=true make build
+        run: make build
       - name: Configure AWS Credentials
         if: github.event_name == 'push' && steps.branch.outputs.branch != null && github.repository == 'crystal-lang/crystal-book'
         uses: aws-actions/configure-aws-credentials@v1
diff --git a/mkdocs.yml b/mkdocs.yml
index 4ca032d95..c358c4e0d 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -58,7 +58,7 @@ plugins:
         governance.md: https://crystal-lang.org/community/governance
         platform_support.md: syntax_and_semantics/platform_support.md
   - code-validator:
-      enabled: !ENV [LINT, false]
+      enabled: !ENV [LINT, true]
       identifiers:
         crystal:
           validators:
diff --git a/netlify.toml b/netlify.toml
index 03b3e3cfc..dffcb7ac5 100644
--- a/netlify.toml
+++ b/netlify.toml
@@ -4,3 +4,5 @@
   command = "mkdocs build -d site --strict"
   publish = "site/"
 
+[context.deploy-preview.environment]
+  LINT = "false"