diff --git a/openmp/runtime/src/kmp_barrier.h b/openmp/runtime/src/kmp_barrier.h
--- a/openmp/runtime/src/kmp_barrier.h
+++ b/openmp/runtime/src/kmp_barrier.h
@@ -21,7 +21,11 @@
 #define KMP_ALIGNED_ALLOCATE(size, alignment) _mm_malloc(size, alignment)
 #define KMP_ALIGNED_FREE(ptr) _mm_free(ptr)
 #elif KMP_HAVE_ALIGNED_ALLOC
-#define KMP_ALIGNED_ALLOCATE(size, alignment) aligned_alloc(alignment, size)
+static inline size_t roundup(size_t val, size_t to) {
+  return (val + to - 1) / to * to;
+}
+#define KMP_ALIGNED_ALLOCATE(size, alignment)                                  \
+  aligned_alloc(alignment, roundup(size, alignment))
 #define KMP_ALIGNED_FREE(ptr) free(ptr)
 #elif KMP_HAVE_POSIX_MEMALIGN
 static inline void *KMP_ALIGNED_ALLOCATE(size_t size, size_t alignment) {