diff --git a/c/grains/src/grains.c b/c/grains/src/grains.c
index ba830a3..4a4dccd 100644
--- a/c/grains/src/grains.c
+++ b/c/grains/src/grains.c
@@ -1,10 +1,5 @@
 #include "grains.h"
 
-static int validSquare(int n) {
-  if (n >= 1 && n <= 64) return 1;
-  return 0;
-}
-
 unsigned long long square(int n) {
   if (!validSquare(n)) return 0;
   if (n == 1) return 1;