diff --git a/CHANGES b/CHANGES
index ada5bd698..5aa3abebd 100644
--- a/CHANGES
+++ b/CHANGES
@@ -5,6 +5,7 @@ Emulation fixes:
  - GBA SIO: Fix MULTI mode SIOCNT bit 7 writes on secondary GBAs (fixes mgba.io/i/3110)
 Other fixes:
  - GBA Audio: Fix crash if audio FIFOs and timers get out of sync
+ - GBA Audio: Fix crash in audio subsampling if timing lockstep breaks
  - GBA Memory: Let raw access read high MMIO addresses
  - Qt: Fix crash when applying changes to GB I/O registers in I/O view
  - Qt: Fix LCDC background priority/enable bit being mis-mapped in I/O view
diff --git a/src/gba/audio.c b/src/gba/audio.c
index e03dcc006..e99a63c33 100644
--- a/src/gba/audio.c
+++ b/src/gba/audio.c
@@ -268,6 +268,9 @@ void GBAAudioWriteSOUNDBIAS(struct GBAAudio* audio, uint16_t value) {
 	if (oldSampleInterval != audio->sampleInterval) {
 		timestamp -= audio->lastSample;
 		audio->sampleIndex = timestamp >> (9 - GBARegisterSOUNDBIASGetResolution(value));
+		if (audio->sampleIndex < 0 || audio->sampleIndex >= GBA_MAX_SAMPLES) {
+			audio->sampleIndex = 0;
+		}
 		if (audio->p->stream && audio->p->stream->audioRateChanged) {
 			audio->p->stream->audioRateChanged(audio->p->stream, GBA_ARM7TDMI_FREQUENCY / audio->sampleInterval);
 		}