diff --git a/malloc/malloc.c b/malloc/malloc.c
index be29929993..20f24cce9f 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -1906,7 +1906,7 @@ static __always_inline void
 thp_init (void)
 {
   /* Initialize only once if DEFAULT_THP_PAGESIZE is defined.  */
-  if (!DEFAULT_THP_PAGESIZE || mp_.thp_mode != malloc_thp_mode_not_supported)
+  if (DEFAULT_THP_PAGESIZE == 0 || mp_.thp_mode != malloc_thp_mode_not_supported)
     return;
 
   /* Set thp_pagesize even if thp_mode is never.  This reduces frequency