diff --git a/winpr/libwinpr/utils/lodepng/lodepng.c b/winpr/libwinpr/utils/lodepng/lodepng.c
index 227d46906..87f85080e 100644
--- a/winpr/libwinpr/utils/lodepng/lodepng.c
+++ b/winpr/libwinpr/utils/lodepng/lodepng.c
@@ -327,7 +327,8 @@ static void string_set(char** out, const char* in)
 
 static unsigned lodepng_read32bitInt(const unsigned char* buffer)
 {
-	return (unsigned)((buffer[0] << 24) | (buffer[1] << 16) | (buffer[2] << 8) | buffer[3]);
+	return (unsigned)(((unsigned)buffer[0] << 24) | ((unsigned)buffer[1] << 16) |
+	                  ((unsigned)buffer[2] << 8) | buffer[3]);
 }
 
 #if defined(LODEPNG_COMPILE_PNG) || defined(LODEPNG_COMPILE_ENCODER)