diff --git a/.appveyor.yml b/.appveyor.yml
index b5332a12..42b97490 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -35,9 +35,9 @@ test_script:
 
 - cmd: >-
 
-    msbuild /t:Build PlatformToolset=DefaultPlatformToolset cryptlib.vcxproj
-    msbuild /t:Build PlatformToolset=DefaultPlatformToolset cryptest.vcxproj
-    msbuild /t:CopyCryptestToRoot PlatformToolset=DefaultPlatformToolset cryptest.vcxproj
+    msbuild /t:Build /p:PlatformToolset=DefaultPlatformToolset cryptlib.vcxproj
+    msbuild /t:Build /p:PlatformToolset=DefaultPlatformToolset cryptest.vcxproj
+    msbuild /t:CopyCryptestToRoot /p:PlatformToolset=DefaultPlatformToolset cryptest.vcxproj
 
     cryptest.exe v