diff --git a/appveyor.yml b/appveyor.yml
index 62bfa14..9d4643d 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -90,7 +90,7 @@ build: off
 
 test_script:
   - PATH=%ADDPATH%%PATH%
-  = if not "%ENV_SCRIPT%" == "" call "%ENV_SCRIPT%"
+  - if not "%ENV_SCRIPT%" == "" call "%ENV_SCRIPT%"
   - if not "%CXXSTD%" == "" set CXXSTD=cxxstd=%CXXSTD%
   - if not "%ADDRMD%" == "" set ADDRMD=address-model=%ADDRMD%
   - b2 -j %NUMBER_OF_PROCESSORS% libs/utility/test toolset=%TOOLSET% %CXXSTD% %ADDRMD% variant=debug,release