diff --git a/appveyor.yml b/appveyor.yml
index f9cdd81b..2fddc453 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -34,11 +34,9 @@ build_script:
 
     echo %APPVEYOR_BUILD_WORKER_IMAGE%
 
-    if %APPVEYOR_BUILD_WORKER_IMAGE%=="Visual Studio 2015" "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" x64
-
-
-    if %APPVEYOR_BUILD_WORKER_IMAGE%=="Visual Studio 2013" "C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\vcvarsall.bat" x64
+    if "%APPVEYOR_BUILD_WORKER_IMAGE%"=="Visual Studio 2015" "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" x64
 
+    if "%APPVEYOR_BUILD_WORKER_IMAGE%"=="Visual Studio 2013" "C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\vcvarsall.bat" x64
 
     cmake -G "NMake Makefiles" -DPAHO_WITH_SSL=TRUE -DPAHO_BUILD_DOCUMENTATION=FALSE -DPAHO_BUILD_SAMPLES=TRUE -DCMAKE_BUILD_TYPE=Release -DCMAKE_VERBOSE_MAKEFILE=TRUE ..