diff --git a/include/mgba/core/core.h b/include/mgba/core/core.h
index dcd9bffb1..59d75ebea 100644
--- a/include/mgba/core/core.h
+++ b/include/mgba/core/core.h
@@ -111,7 +111,7 @@ struct mCore {
 	void (*setCursorLocation)(struct mCore*, int x, int y);
 	void (*setCursorDown)(struct mCore*, bool down);
 
-	int32_t (*frameCounter)(const struct mCore*);
+	uint32_t (*frameCounter)(const struct mCore*);
 	int32_t (*frameCycles)(const struct mCore*);
 	int32_t (*frequency)(const struct mCore*);
 
diff --git a/include/mgba/internal/gb/serialize.h b/include/mgba/internal/gb/serialize.h
index 5191e0966..5a26a6937 100644
--- a/include/mgba/internal/gb/serialize.h
+++ b/include/mgba/internal/gb/serialize.h
@@ -329,7 +329,7 @@ struct GBSerializedState {
 		uint32_t reserved;
 		uint32_t nextMode;
 		int32_t dotCounter;
-		int32_t frameCounter;
+		uint32_t frameCounter;
 
 		uint8_t vramCurrentBank;
 		GBSerializedVideoFlags flags;
diff --git a/include/mgba/internal/gb/video.h b/include/mgba/internal/gb/video.h
index da83ebc2a..31c54b089 100644
--- a/include/mgba/internal/gb/video.h
+++ b/include/mgba/internal/gb/video.h
@@ -163,7 +163,7 @@ struct GBVideo {
 
 	bool sgbBorders;
 
-	int32_t frameCounter;
+	uint32_t frameCounter;
 	int frameskip;
 	int frameskipCounter;
 };
diff --git a/include/mgba/internal/gba/serialize.h b/include/mgba/internal/gba/serialize.h
index b9bdcbea7..203c4fb0c 100644
--- a/include/mgba/internal/gba/serialize.h
+++ b/include/mgba/internal/gba/serialize.h
@@ -303,7 +303,7 @@ struct GBASerializedState {
 		int32_t nextEvent;
 		int32_t reserved[5];
 		GBASerializedVideoFlags flags;
-		int32_t frameCounter;
+		uint32_t frameCounter;
 	} video;
 
 	struct {
diff --git a/include/mgba/internal/gba/video.h b/include/mgba/internal/gba/video.h
index 3d90fc571..94ac19f3e 100644
--- a/include/mgba/internal/gba/video.h
+++ b/include/mgba/internal/gba/video.h
@@ -220,7 +220,7 @@ struct GBAVideo {
 	uint16_t* vram;
 	union GBAOAM oam;
 
-	int32_t frameCounter;
+	uint32_t frameCounter;
 	int frameskip;
 	int frameskipCounter;
 };
diff --git a/src/debugger/debugger.c b/src/debugger/debugger.c
index 169123451..bdf7b1cab 100644
--- a/src/debugger/debugger.c
+++ b/src/debugger/debugger.c
@@ -108,7 +108,7 @@ void mDebuggerRun(struct mDebugger* debugger) {
 }
 
 void mDebuggerRunFrame(struct mDebugger* debugger) {
-	int32_t frame = debugger->core->frameCounter(debugger->core);
+	uint32_t frame = debugger->core->frameCounter(debugger->core);
 	do {
 		mDebuggerRun(debugger);
 	} while (debugger->core->frameCounter(debugger->core) == frame);
diff --git a/src/ds/core.c b/src/ds/core.c
index 767d5e2c3..6fddeea31 100644
--- a/src/ds/core.c
+++ b/src/ds/core.c
@@ -466,7 +466,7 @@ static void _DSCoreSetCursorDown(struct mCore* core, bool down) {
 	dscore->touchDown = down;
 }
 
-static int32_t _DSCoreFrameCounter(const struct mCore* core) {
+static uint32_t _DSCoreFrameCounter(const struct mCore* core) {
 	struct DS* ds = core->board;
 	return ds->video.frameCounter;
 }
diff --git a/src/gb/core.c b/src/gb/core.c
index 6e39bad68..f5fd6343a 100644
--- a/src/gb/core.c
+++ b/src/gb/core.c
@@ -648,7 +648,7 @@ static void _GBCoreReset(struct mCore* core) {
 
 static void _GBCoreRunFrame(struct mCore* core) {
 	struct GB* gb = core->board;
-	int32_t frameCounter = gb->video.frameCounter;
+	uint32_t frameCounter = gb->video.frameCounter;
 	while (gb->video.frameCounter == frameCounter) {
 		SM83Run(core->cpu);
 	}
@@ -711,7 +711,7 @@ static void _GBCoreSetCursorDown(struct mCore* core, bool down) {
 	UNUSED(down);
 }
 
-static int32_t _GBCoreFrameCounter(const struct mCore* core) {
+static uint32_t _GBCoreFrameCounter(const struct mCore* core) {
 	const struct GB* gb = core->board;
 	return gb->video.frameCounter;
 }
diff --git a/src/gba/core.c b/src/gba/core.c
index f24f4c5ec..90a64f0d2 100644
--- a/src/gba/core.c
+++ b/src/gba/core.c
@@ -676,7 +676,7 @@ static void _GBACoreReset(struct mCore* core) {
 
 static void _GBACoreRunFrame(struct mCore* core) {
 	struct GBA* gba = core->board;
-	int32_t frameCounter = gba->video.frameCounter;
+	uint32_t frameCounter = gba->video.frameCounter;
 	uint32_t startCycle = mTimingCurrentTime(&gba->timing);
 	while (gba->video.frameCounter == frameCounter && mTimingCurrentTime(&gba->timing) - startCycle < VIDEO_TOTAL_LENGTH + VIDEO_HORIZONTAL_LENGTH) {
 		ARMv4RunLoop(core->cpu);
@@ -734,7 +734,7 @@ static void _GBACoreSetCursorDown(struct mCore* core, bool down) {
 	UNUSED(down);
 }
 
-static int32_t _GBACoreFrameCounter(const struct mCore* core) {
+static uint32_t _GBACoreFrameCounter(const struct mCore* core) {
 	const struct GBA* gba = core->board;
 	return gba->video.frameCounter;
 }