diff --git a/include/sndcore2/core.h b/include/sndcore2/core.h
index 19a4dbd..1a4d492 100644
--- a/include/sndcore2/core.h
+++ b/include/sndcore2/core.h
@@ -77,6 +77,9 @@ AXSetDefaultMixerSelect(uint32_t unk0);
 AXResult
 AXRegisterAppFrameCallback(AXFrameCallback callback);
 
+AXResult
+AXDeregisterAppFrameCallback(AXFrameCallback callback);
+
 AXFrameCallback
 AXRegisterFrameCallback(AXFrameCallback callback);