diff --git a/libgphoto2/bayer.c b/libgphoto2/bayer.c
index 94141377a..1fea1e2da 100644
--- a/libgphoto2/bayer.c
+++ b/libgphoto2/bayer.c
@@ -43,7 +43,7 @@ gp_bayer_expand (unsigned char *input, int w, int h, unsigned char *output,
 {
 	int x, y, i;
 	int colour, bayer;
-	char *ptr = input;
+	char *ptr = (char*)input;
 
 	switch (tile) {