diff --git a/reactos/dll/win32/mmdrv/CMakeLists.txt b/reactos/dll/win32/mmdrv/CMakeLists.txt
index c5ff0b12648..89b2d6b2fa6 100644
--- a/reactos/dll/win32/mmdrv/CMakeLists.txt
+++ b/reactos/dll/win32/mmdrv/CMakeLists.txt
@@ -1,6 +1,5 @@
 
 
-add_definitions(-DNDEBUG)
 
 spec2def(mmdrv.dll mmdrv.spec)