diff --git a/src/util/u_math.h b/src/util/u_math.h
index e714adc2249..9bfe395e113 100644
--- a/src/util/u_math.h
+++ b/src/util/u_math.h
@@ -830,7 +830,7 @@ util_clamped_uadd(unsigned a, unsigned b)
 static inline bool
 util_is_aligned(uintmax_t n, uintmax_t a)
 {
-   assert(a == (a & -a));
+   assert((a != 0) && ((a & (a - 1)) == 0));
    return (n & (a - 1)) == 0;
 }