diff --git a/common/music/adlmidi_dynamic.cpp b/common/music/adlmidi_dynamic.cpp
index ce9d283d8..29ffeaa1d 100644
--- a/common/music/adlmidi_dynamic.cpp
+++ b/common/music/adlmidi_dynamic.cpp
@@ -87,12 +87,12 @@ static ADL_MIDIPlayer *adl_init_first_call(long sample_rate)
 }
 
 ADL_MIDIPlayer *(*adl_init)(long sample_rate) = &adl_init_first_call;
-void (*adl_close)(ADL_MIDIPlayer *device) = nullptr;
-int (*adl_switchEmulator)(ADL_MIDIPlayer *device, int emulator) = nullptr;
-int (*adl_setNumChips)(ADL_MIDIPlayer *device, int numChips) = nullptr;
-int (*adl_setBank)(ADL_MIDIPlayer *device, int bank) = nullptr;
-void (*adl_setSoftPanEnabled)(ADL_MIDIPlayer *device, int softPanEn) = nullptr;
-void (*adl_setLoopEnabled)(ADL_MIDIPlayer *device, int loopEn) = nullptr;
-int (*adl_openData)(ADL_MIDIPlayer *device, const void *mem, unsigned long size) = nullptr;
-int (*adl_openFile)(ADL_MIDIPlayer *device, const char *filePath) = nullptr;
-int (*adl_playFormat)(ADL_MIDIPlayer *device, int sampleCount, uint8_t *left, uint8_t *right, const ADLMIDI_AudioFormat *format) = nullptr;
+void (*adl_close)(ADL_MIDIPlayer *device);
+int (*adl_switchEmulator)(ADL_MIDIPlayer *device, int emulator);
+int (*adl_setNumChips)(ADL_MIDIPlayer *device, int numChips);
+int (*adl_setBank)(ADL_MIDIPlayer *device, int bank);
+void (*adl_setSoftPanEnabled)(ADL_MIDIPlayer *device, int softPanEn);
+void (*adl_setLoopEnabled)(ADL_MIDIPlayer *device, int loopEn);
+int (*adl_openData)(ADL_MIDIPlayer *device, const void *mem, unsigned long size);
+int (*adl_openFile)(ADL_MIDIPlayer *device, const char *filePath);
+int (*adl_playFormat)(ADL_MIDIPlayer *device, int sampleCount, uint8_t *left, uint8_t *right, const ADLMIDI_AudioFormat *format);