diff --git a/CMakeLists.txt b/CMakeLists.txt
index b9a85442..283522a8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -156,6 +156,8 @@ if(MINIAUDIO_NO_NULL)
     list(APPEND COMPILE_DEFINES MA_NO_NULL)
 endif()
 if(MINIAUDIO_ENABLE_ONLY_SPECIFIC_BACKENDS)
+    list(APPEND COMPILE_DEFINES MA_ENABLE_ONLY_SPECIFIC_BACKENDS)
+
     if(MINIAUDIO_ENABLE_WASAPI)
         list(APPEND COMPILE_DEFINES MA_ENABLE_WASAPI)
     endif()