diff --git a/test/utils.h b/test/utils.h
index 82d6c25b..73c0e586 100644
--- a/test/utils.h
+++ b/test/utils.h
@@ -235,6 +235,7 @@ static __inline uint64_t mul_64x64_high(uint64_t a, uint64_t b) {
 
 static __inline bool is_power2(size_t x) { return (x & (x - 1)) == 0; }
 
+#undef roundup2
 static __inline size_t roundup2(size_t value, size_t granularity) {
   assert(is_power2(granularity));
   return (value + granularity - 1) & ~(granularity - 1);