diff --git a/twinmax/display.cpp b/twinmax/display.cpp
index 7cc79e7..59fc47b 100644
--- a/twinmax/display.cpp
+++ b/twinmax/display.cpp
@@ -196,11 +196,11 @@ void Display::progress(const short progress, const uint8_t startLine, const uint
 		setPixel(64, endLine, true);
 	}
 
-	uint16_t scaledProgress = (progress+7) / 8;
+	int16_t scaledProgress = (progress+7) / 8;
 
 	// draw absolute progression
 	if( absolute ){
-		for( uint8_t x = 0 ; x < scaledProgress ; x++ ){
+		for( uint8_t x = 0 ; x < scaledProgress && x < 128 ; x++ ){
 			for( uint8_t y = startLine+1 ; y < endLine ; y++ ){
 				setPixel(x, y, true);
 			}
@@ -211,7 +211,7 @@ void Display::progress(const short progress, const uint8_t startLine, const uint
 	// draw left relative progression
 	if( progress < 512 ){
 
-		for( uint8_t x = scaledProgress ; x < 64 ; x++ ){
+		for( int16_t x = 64 ; x > scaledProgress && x >= 0 ; x-- ){
 			for( uint8_t y = startLine+1 ; y < endLine ; y++ ){
 				setPixel(x, y, true);
 			}
@@ -220,7 +220,7 @@ void Display::progress(const short progress, const uint8_t startLine, const uint
 	// draw right relative progression
 	} else {
 
-		for( uint8_t x = 64 ; x < scaledProgress ; x++ ){
+		for( uint8_t x = 64 ; x < scaledProgress && x < 128 ; x++ ){
 			for( uint8_t y = startLine+1 ; y < endLine ; y++ ){
 				setPixel(x, y, true);
 			}