diff --git a/src/sound/CMakeLists.txt b/src/sound/CMakeLists.txt
index 5e743c4ac..349fb2925 100644
--- a/src/sound/CMakeLists.txt
+++ b/src/sound/CMakeLists.txt
@@ -63,7 +63,7 @@ else()
 endif()
 
 if(SYSTEM_MIDI)
-    target_compile_definition(snd PRIVATE SYSTEM_MIDI)
+    target_compile_definitions(snd PRIVATE SYSTEM_MIDI)
 endif()
 
 if(FLUIDSYNTH)