diff --git a/AK/Math.h b/AK/Math.h
index ed6d91c3678..469cc7e5ecb 100644
--- a/AK/Math.h
+++ b/AK/Math.h
@@ -298,7 +298,7 @@ constexpr T log2(T x)
 template<Integral T>
 constexpr T log2(T x)
 {
-    return x ? 8 * sizeof(T) - count_leading_zeroes(static_cast<MakeUnsigned<T>>(x)) : 0;
+    return x ? (8 * sizeof(T) - 1) - count_leading_zeroes(static_cast<MakeUnsigned<T>>(x)) : 0;
 }
 
 template<FloatingPoint T>