diff --git a/src/drivers/Qt/ConsoleViewerGL.cpp b/src/drivers/Qt/ConsoleViewerGL.cpp
index 28383b40..dc0ed2c3 100644
--- a/src/drivers/Qt/ConsoleViewerGL.cpp
+++ b/src/drivers/Qt/ConsoleViewerGL.cpp
@@ -218,7 +218,7 @@ void ConsoleViewGL_t::transfer2LocalBuffer(void)
 {
 	int i=0, hq = 0;
 	int numPixels = nes_shm->video.ncol * nes_shm->video.nrow;
-	int cpSize = numPixels * 4;
+	unsigned int cpSize = numPixels * 4;
  	uint8_t *src, *dest;
 
 	if ( cpSize > localBufSize )
diff --git a/src/drivers/Qt/ConsoleViewerSDL.cpp b/src/drivers/Qt/ConsoleViewerSDL.cpp
index a345fb37..07327d14 100644
--- a/src/drivers/Qt/ConsoleViewerSDL.cpp
+++ b/src/drivers/Qt/ConsoleViewerSDL.cpp
@@ -135,7 +135,7 @@ void ConsoleViewSDL_t::transfer2LocalBuffer(void)
 {
 	int i=0, hq = 0;
 	int numPixels = nes_shm->video.ncol * nes_shm->video.nrow;
-	int cpSize = numPixels * 4;
+	unsigned int cpSize = numPixels * 4;
  	uint8_t *src, *dest;
 
 	if ( cpSize > localBufSize )