diff --git a/appveyor.yml b/appveyor.yml
index 1ce41a81..4edcd7a7 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -37,7 +37,7 @@ before_build:
 - set Path=%MINGW_SDK%\bin;%Path%
 - i686-w64-mingw32-gcc --version
 - mingw32-make --version
-- set SRB2_MFLAGS="-C src MINGW=1 WARNINGMODE=1 NOASM=1 NOUPX=1 GCC53=1"
+- set SRB2_MFLAGS=-C src MINGW=1 WARNINGMODE=1 NOASM=1 NOUPX=1 GCC53=1
 
 build_script:
 - cmd: mingw32-make.exe %SRB2_MFLAGS% SDL=1 clean