diff --git a/tests/checkasm/sw_rgb.c b/tests/checkasm/sw_rgb.c
index d2b211f7b4..000420d8f7 100644
--- a/tests/checkasm/sw_rgb.c
+++ b/tests/checkasm/sw_rgb.c
@@ -68,7 +68,7 @@ static void check_shuffle_bytes(void * func, const char * report)
     }
 }
 
-static void check_uyvy_to_422p()
+static void check_uyvy_to_422p(void)
 {
     int i;