diff --git a/src/gba/renderers/video-software.c b/src/gba/renderers/video-software.c
index 7dae88af6..9924501db 100644
--- a/src/gba/renderers/video-software.c
+++ b/src/gba/renderers/video-software.c
@@ -19,7 +19,7 @@ static void GBAVideoSoftwareRendererWritePalette(struct GBAVideoRenderer* render
 static uint16_t GBAVideoSoftwareRendererWriteVideoRegister(struct GBAVideoRenderer* renderer, uint32_t address, uint16_t value);
 static void GBAVideoSoftwareRendererDrawScanline(struct GBAVideoRenderer* renderer, int y);
 static void GBAVideoSoftwareRendererFinishFrame(struct GBAVideoRenderer* renderer);
-static void GBAVideoSoftwareRendererGetPixels(struct GBAVideoRenderer* renderer, unsigned* stride, void** pixels);
+static void GBAVideoSoftwareRendererGetPixels(struct GBAVideoRenderer* renderer, unsigned* stride, const void** pixels);
 static void GBAVideoSoftwareRendererPutPixels(struct GBAVideoRenderer* renderer, unsigned stride, void* pixels);
 
 static void GBAVideoSoftwareRendererUpdateDISPCNT(struct GBAVideoSoftwareRenderer* renderer);
@@ -558,7 +558,7 @@ static void GBAVideoSoftwareRendererFinishFrame(struct GBAVideoRenderer* rendere
 	softwareRenderer->bg[3].sy = softwareRenderer->bg[3].refy;
 }
 
-static void GBAVideoSoftwareRendererGetPixels(struct GBAVideoRenderer* renderer, unsigned* stride, void** pixels) {
+static void GBAVideoSoftwareRendererGetPixels(struct GBAVideoRenderer* renderer, unsigned* stride, const void** pixels) {
 	struct GBAVideoSoftwareRenderer* softwareRenderer = (struct GBAVideoSoftwareRenderer*) renderer;
 
 	*stride = softwareRenderer->outputBufferStride;
diff --git a/src/gba/serialize.c b/src/gba/serialize.c
index 814a47d52..1a98efde6 100644
--- a/src/gba/serialize.c
+++ b/src/gba/serialize.c
@@ -196,7 +196,7 @@ struct VFile* GBAGetState(struct GBA* gba, struct VDir* dir, int slot, bool writ
 #ifdef USE_PNG
 static bool _savePNGState(struct GBA* gba, struct VFile* vf) {
 	unsigned stride;
-	void* pixels = 0;
+	const void* pixels = 0;
 	gba->video.renderer->getPixels(gba->video.renderer, &stride, &pixels);
 	if (!pixels) {
 		return false;
@@ -367,8 +367,8 @@ void GBARecordFrame(struct GBAThread* thread) {
 
 	if (thread->rewindScreenBuffer) {
 		unsigned stride;
-		uint8_t* pixels = 0;
-		thread->gba->video.renderer->getPixels(thread->gba->video.renderer, &stride, (void*) &pixels);
+		const uint8_t* pixels = 0;
+		thread->gba->video.renderer->getPixels(thread->gba->video.renderer, &stride, (const void**) &pixels);
 		if (pixels) {
 			size_t y;
 			for (y = 0; y < VIDEO_VERTICAL_PIXELS; ++y) {
diff --git a/src/gba/supervisor/thread.c b/src/gba/supervisor/thread.c
index 5f5e23776..c1664af43 100644
--- a/src/gba/supervisor/thread.c
+++ b/src/gba/supervisor/thread.c
@@ -757,7 +757,7 @@ struct GBAThread* GBAThreadGetContext(void) {
 #ifdef USE_PNG
 void GBAThreadTakeScreenshot(struct GBAThread* threadContext) {
 	unsigned stride;
-	void* pixels = 0;
+	const void* pixels = 0;
 	struct VFile* vf = VDirOptionalOpenIncrementFile(threadContext->stateDir, threadContext->gba->activeFile, "screenshot", "-", ".png", O_CREAT | O_TRUNC | O_WRONLY);
 	threadContext->gba->video.renderer->getPixels(threadContext->gba->video.renderer, &stride, &pixels);
 	png_structp png = PNGWriteOpen(vf);
diff --git a/src/gba/video.c b/src/gba/video.c
index 05b3818d8..d843d2470 100644
--- a/src/gba/video.c
+++ b/src/gba/video.c
@@ -22,7 +22,7 @@ static void GBAVideoDummyRendererWritePalette(struct GBAVideoRenderer* renderer,
 static void GBAVideoDummyRendererWriteOAM(struct GBAVideoRenderer* renderer, uint32_t oam);
 static void GBAVideoDummyRendererDrawScanline(struct GBAVideoRenderer* renderer, int y);
 static void GBAVideoDummyRendererFinishFrame(struct GBAVideoRenderer* renderer);
-static void GBAVideoDummyRendererGetPixels(struct GBAVideoRenderer* renderer, unsigned* stride, void** pixels);
+static void GBAVideoDummyRendererGetPixels(struct GBAVideoRenderer* renderer, unsigned* stride, const void** pixels);
 
 const int GBAVideoObjSizes[16][2] = {
 	{ 8, 8 },
@@ -260,7 +260,7 @@ static void GBAVideoDummyRendererFinishFrame(struct GBAVideoRenderer* renderer)
 	// Nothing to do
 }
 
-static void GBAVideoDummyRendererGetPixels(struct GBAVideoRenderer* renderer, unsigned* stride, void** pixels) {
+static void GBAVideoDummyRendererGetPixels(struct GBAVideoRenderer* renderer, unsigned* stride, const void** pixels) {
 	UNUSED(renderer);
 	UNUSED(stride);
 	UNUSED(pixels);
diff --git a/src/gba/video.h b/src/gba/video.h
index 6713a8f0b..11957e4de 100644
--- a/src/gba/video.h
+++ b/src/gba/video.h
@@ -167,7 +167,7 @@ struct GBAVideoRenderer {
 	void (*drawScanline)(struct GBAVideoRenderer* renderer, int y);
 	void (*finishFrame)(struct GBAVideoRenderer* renderer);
 
-	void (*getPixels)(struct GBAVideoRenderer* renderer, unsigned* stride, void** pixels);
+	void (*getPixels)(struct GBAVideoRenderer* renderer, unsigned* stride, const void** pixels);
 	void (*putPixels)(struct GBAVideoRenderer* renderer, unsigned stride, void* pixels);
 
 	uint16_t* palette;
diff --git a/src/platform/ffmpeg/ffmpeg-encoder.c b/src/platform/ffmpeg/ffmpeg-encoder.c
index a30f27e56..8c423e977 100644
--- a/src/platform/ffmpeg/ffmpeg-encoder.c
+++ b/src/platform/ffmpeg/ffmpeg-encoder.c
@@ -423,9 +423,9 @@ void _ffmpegPostVideoFrame(struct GBAAVStream* stream, struct GBAVideoRenderer*
 	if (!encoder->context) {
 		return;
 	}
-	uint8_t* pixels;
+	const uint8_t* pixels;
 	unsigned stride;
-	renderer->getPixels(renderer, &stride, (void**) &pixels);
+	renderer->getPixels(renderer, &stride, (const void**) &pixels);
 	stride *= BYTES_PER_PIXEL;
 
 	AVPacket packet;
diff --git a/src/platform/imagemagick/imagemagick-gif-encoder.c b/src/platform/imagemagick/imagemagick-gif-encoder.c
index bd7b1d9e7..190a90f96 100644
--- a/src/platform/imagemagick/imagemagick-gif-encoder.c
+++ b/src/platform/imagemagick/imagemagick-gif-encoder.c
@@ -53,9 +53,9 @@ static void _magickPostVideoFrame(struct GBAAVStream* stream, struct GBAVideoRen
 		return;
 	}
 
-	uint8_t* pixels;
+	const uint8_t* pixels;
 	unsigned stride;
-	renderer->getPixels(renderer, &stride, (void**) &pixels);
+	renderer->getPixels(renderer, &stride, (const void**) &pixels);
 	size_t row;
 	for (row = 0; row < VIDEO_VERTICAL_PIXELS; ++row) {
 		memcpy(&encoder->frame[row * VIDEO_HORIZONTAL_PIXELS], &pixels[row * 4 * stride], VIDEO_HORIZONTAL_PIXELS * 4);
diff --git a/src/platform/libretro/libretro.c b/src/platform/libretro/libretro.c
index 03863f775..8c6b481dc 100644
--- a/src/platform/libretro/libretro.c
+++ b/src/platform/libretro/libretro.c
@@ -407,7 +407,7 @@ static void _postAudioBuffer(struct GBAAVStream* stream, struct GBAAudio* audio)
 
 static void _postVideoFrame(struct GBAAVStream* stream, struct GBAVideoRenderer* renderer) {
 	UNUSED(stream);
-	void* pixels;
+	const void* pixels;
 	unsigned stride;
 	renderer->getPixels(renderer, &stride, &pixels);
 	videoCallback(pixels, VIDEO_HORIZONTAL_PIXELS, VIDEO_VERTICAL_PIXELS, BYTES_PER_PIXEL * stride);
diff --git a/src/util/png-io.c b/src/util/png-io.c
index a3384ba00..5994a339b 100644
--- a/src/util/png-io.c
+++ b/src/util/png-io.c
@@ -48,12 +48,12 @@ png_infop PNGWriteHeader(png_structp png, unsigned width, unsigned height) {
 	return info;
 }
 
-bool PNGWritePixels(png_structp png, unsigned width, unsigned height, unsigned stride, void* pixels) {
+bool PNGWritePixels(png_structp png, unsigned width, unsigned height, unsigned stride, const void* pixels) {
 	png_bytep row = malloc(sizeof(png_bytep) * width * 3);
 	if (!row) {
 		return false;
 	}
-	png_bytep pixelData = pixels;
+	png_const_bytep pixelData = pixels;
 	if (setjmp(png_jmpbuf(png))) {
 		free(row);
 		return false;
@@ -81,7 +81,7 @@ bool PNGWriteCustomChunk(png_structp png, const char* name, size_t size, void* d
 	if (setjmp(png_jmpbuf(png))) {
 		return false;
 	}
-	png_write_chunk(png, (const png_bytep) realName, data, size);
+	png_write_chunk(png, (png_const_bytep) realName, data, size);
 	return true;
 }
 
@@ -117,7 +117,7 @@ bool PNGInstallChunkHandler(png_structp png, void* context, ChunkHandler handler
 		return false;
 	}
 	png_set_read_user_chunk_fn(png, context, handler);
-	png_set_keep_unknown_chunks(png, PNG_HANDLE_CHUNK_ALWAYS, (const png_bytep) chunkName, 1);
+	png_set_keep_unknown_chunks(png, PNG_HANDLE_CHUNK_ALWAYS, (png_const_bytep) chunkName, 1);
 	return true;
 }
 
diff --git a/src/util/png-io.h b/src/util/png-io.h
index 4ecafd260..d0fff9c70 100644
--- a/src/util/png-io.h
+++ b/src/util/png-io.h
@@ -20,7 +20,7 @@ enum {
 
 png_structp PNGWriteOpen(struct VFile* source);
 png_infop PNGWriteHeader(png_structp png, unsigned width, unsigned height);
-bool PNGWritePixels(png_structp png, unsigned width, unsigned height, unsigned stride, void* pixels);
+bool PNGWritePixels(png_structp png, unsigned width, unsigned height, unsigned stride, const void* pixels);
 bool PNGWriteCustomChunk(png_structp png, const char* name, size_t size, void* data);
 void PNGWriteClose(png_structp png, png_infop info);