diff --git a/appveyor.yml b/appveyor.yml
index 2fb839a5f..ac88bbcf8 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -15,17 +15,12 @@ platform:
   - x64
   - Win32
 
-environment:
-  matrix:
-    - JERRY_DEBUGGER: ON
-    - JERRY_DEBUGGER: OFF
-
 # Steps of a job.
 init:
   - cmake -version
 before_build:
-  - if "%PLATFORM%"=="Win32" cmake -G"Visual Studio 15 2017" -Bbuild -H. -DJERRY_DEBUGGER=%JERRY_DEBUGGER%
-  - if "%PLATFORM%"=="x64" cmake -G"Visual Studio 15 2017 Win64" -Bbuild -H. -DJERRY_DEBUGGER=%JERRY_DEBUGGER%
+  - if "%PLATFORM%"=="Win32" cmake -G"Visual Studio 15 2017" -Bbuild -H. -DJERRY_DEBUGGER=ON
+  - if "%PLATFORM%"=="x64" cmake -G"Visual Studio 15 2017 Win64" -Bbuild -H. -DJERRY_DEBUGGER=ON
 build:
   project: build\Jerry.sln
   parallel: true