diff --git a/SystemConfiguration.h b/SystemConfiguration.h
index d1a8cdd..576ef64 100644
--- a/SystemConfiguration.h
+++ b/SystemConfiguration.h
@@ -203,7 +203,8 @@ unsigned inline dramsim_log2(unsigned value)
 }
 inline bool isPowerOfTwo(unsigned long x)
 {
-	return (1UL<<dramsim_log2(x)) == x;
+	return (x &&  !(x & (x - 1))); //shall be faster needs test
+//	return (1UL<<dramsim_log2(x)) == x;
 }