1 files changed, 5 insertions, 5 deletions
diff --git a/src/sgr.c b/src/sgr.c
index 9e77f18..9faa117 100644
--- a/src/sgr.c
+++ b/src/sgr.c
@@ -48,11 +48,11 @@ static png_color _4bit[] = {
 /* TODO: Add 8-bit and 24-bit modes. */
 
 void
-sgr(char *param, png_colorp fg, png_colorp bg)
+sgr(unsigned char *param, png_colorp fg, png_colorp bg)
 {
-	int   end;
-	char *p;
-	int   i;
+	int            end;
+	unsigned char *p;
+	int            i;
 
 	end = 0;
 	for (p = param; param; ++param) {
@@ -62,7 +62,7 @@ sgr(char *param, png_colorp fg, png_colorp bg)
 			}
 			*param = '\0';
 			if (*p) {
-				i = atoi(p);
+				i = atoi((char *) p);
 			} else {
 				i = 0;
 			}