diff --git a/include/jemalloc/internal/jemalloc_internal.h.in b/include/jemalloc/internal/jemalloc_internal.h.in
index 706c1981..29aa802a 100644
--- a/include/jemalloc/internal/jemalloc_internal.h.in
+++ b/include/jemalloc/internal/jemalloc_internal.h.in
@@ -708,7 +708,7 @@ sa2u(size_t size, size_t alignment)
 		 * Calculate the size of the over-size run that arena_palloc()
 		 * would need to allocate in order to guarantee the alignment.
 		 */
-		if (usize + alignment - PAGE <= arena_maxrun)
+		if (usize + large_pad + alignment - PAGE <= arena_maxrun)
 			return (usize);
 	}