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-rw-r--r--malloc/memusage.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/malloc/memusage.c b/malloc/memusage.c
index e8ae80d..f80225b 100644
--- a/malloc/memusage.c
+++ b/malloc/memusage.c
@@ -172,7 +172,7 @@ update_data (struct header *result, size_t len, size_t old_len)
start_sp = __thread_stack_pointer ();
uintptr_t sp = __thread_stack_pointer ();
-#ifdef _STACK_GROWS_UP
+#if _STACK_GROWS_UP
/* This can happen in threads where we didn't catch the thread's
stack early enough. */
if (__glibc_unlikely (sp < start_sp))