diff --git a/appveyor.yml b/appveyor.yml
index 89651f6d5..0042373b0 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -56,11 +56,11 @@ install:
   # We need to specify the generator here, in case the user has more than one installed.
   # CMake always seems to default to the latest version of Visual Studio, not the one on
   # the current PATH.
-  - echo cmake -G "%generator_name%" -DDEBUG=1
+  - echo cmake -G "%generator_name%"
     -DBOXBACKUP_VERSION=%compiled_version%
     -DSUB_CMAKE_EXTRA_ARGS="-- /verbosity:minimal"
     %APPVEYOR_BUILD_FOLDER%\infrastructure\cmake\windows
-  - cmake -G "%generator_name%" -DDEBUG=1
+  - cmake -G "%generator_name%"
     -DBOXBACKUP_VERSION=%compiled_version%
     -DSUB_CMAKE_EXTRA_ARGS="-- /verbosity:minimal"
     %APPVEYOR_BUILD_FOLDER%\infrastructure\cmake\windows