diff --git a/.travis.yml b/.travis.yml
index 4eefd67373d7346f6e189245eea0c1b10cf3326a..1f28f9d55cba985b36e59da110a151203a122201 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -54,7 +54,7 @@ install:
 script:
   - node_modules/.bin/gulp hygiene
   - node_modules/.bin/gulp electron --silent
-  # - node_modules/.bin/tsc -p ./src/tsconfig.monaco.json --noEmit
+  - node_modules/.bin/tsc -p ./src/tsconfig.monaco.json --noEmit
   - node_modules/.bin/gulp compile --silent --max_old_space_size=4096
   - node_modules/.bin/gulp optimize-vscode --silent --max_old_space_size=4096
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then ./scripts/test.sh --coverage --reporter dot; else ./scripts/test.sh --reporter dot; fi
diff --git a/appveyor.yml b/appveyor.yml
index 18fddd644f2ba0e0ae0b5f6aba0dd8207fa155be..3ece36f7a3e13fe615b0eb45f5b2676c678a14a4 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -11,7 +11,7 @@ install:
 build_script:
   - yarn
   - .\node_modules\.bin\gulp electron
-  # - .\node_modules\.bin\tsc -p .\src\tsconfig.monaco.json --noEmit
+  - .\node_modules\.bin\tsc -p .\src\tsconfig.monaco.json --noEmit
   - npm run compile
 
 test_script:
diff --git a/build/tfs/darwin/build.sh b/build/tfs/darwin/build.sh
index f40b2b1f00502ddbc00bf9655d601f27f76685e0..9c0b7a6f52ab68af7974f1aabe8c8c3be0d8927d 100755
--- a/build/tfs/darwin/build.sh
+++ b/build/tfs/darwin/build.sh
@@ -19,8 +19,8 @@ step "Install dependencies" \
 step "Hygiene" \
 	npm run gulp -- hygiene
 
-# step "Monaco Editor Check" \
-# 	./node_modules/.bin/tsc -p ./src/tsconfig.monaco.json --noEmit
+step "Monaco Editor Check" \
+	./node_modules/.bin/tsc -p ./src/tsconfig.monaco.json --noEmit
 
 step "Mix in repository from vscode-distro" \
 	npm run gulp -- mixin
diff --git a/build/tfs/linux/build.sh b/build/tfs/linux/build.sh
index 1e6fdce6431e781c0a5cdd3652afbf46b47a30c4..e23049b5cf4d693f75e408e546cd2109963166cd 100755
--- a/build/tfs/linux/build.sh
+++ b/build/tfs/linux/build.sh
@@ -22,8 +22,8 @@ step "Install dependencies" \
 step "Hygiene" \
 	npm run gulp -- hygiene
 
-# step "Monaco Editor Check" \
-# 	./node_modules/.bin/tsc -p ./src/tsconfig.monaco.json --noEmit
+step "Monaco Editor Check" \
+	./node_modules/.bin/tsc -p ./src/tsconfig.monaco.json --noEmit
 
 step "Mix in repository from vscode-distro" \
 	npm run gulp -- mixin
diff --git a/build/tfs/win32/1_build.ps1 b/build/tfs/win32/1_build.ps1
index f26b5fc76bbf5224f5b3fde5ef69993638b0987c..bc6ade13de33b4c767daeeead0ccb8bd23200bc9 100644
--- a/build/tfs/win32/1_build.ps1
+++ b/build/tfs/win32/1_build.ps1
@@ -24,9 +24,9 @@ step "Hygiene" {
   exec { & npm run gulp -- hygiene }
 }
 
-# step "Monaco Editor Check" {
-# 	exec { & .\node_modules\.bin\tsc -p .\src\tsconfig.monaco.json --noEmit }
-# }
+step "Monaco Editor Check" {
+	exec { & .\node_modules\.bin\tsc -p .\src\tsconfig.monaco.json --noEmit }
+}
 
 $env:VSCODE_MIXIN_PASSWORD = $mixinPassword
 step "Mix in repository from vscode-distro" {