diff --git a/lib/math.h b/lib/math.h
index a68b506..d5ee07a 100644
--- a/lib/math.h
+++ b/lib/math.h
@@ -1,4 +1,4 @@
 #include "types.h"
 
 long pow(int, uint);
-long square(int);
+long square(uint);