1 files changed, 1 insertions, 1 deletions
diff --git a/src/sgr.h b/src/sgr.h
index 3b2362e..6f5346a 100644
--- a/src/sgr.h
+++ b/src/sgr.h
@@ -25,6 +25,6 @@
 #include <png.h>
 
 void
-sgr(char *param, png_colorp fg, png_colorp bg);
+sgr(unsigned char *param, png_colorp fg, png_colorp bg);
 
 #endif  /* SGR_H_ */