2 files changed, 3 insertions, 2 deletions
diff --git a/libc/stdlib/malloc/alloc.c b/libc/stdlib/malloc/alloc.c
index a521cf2e8..99537a35d 100644
--- a/libc/stdlib/malloc/alloc.c
+++ b/libc/stdlib/malloc/alloc.c
@@ -52,7 +52,7 @@ void free_dbg(void *ptr, char *function, char *file, int line)
 void *realloc_dbg(void *ptr, size_t size, char *function, char *file, int line)
 {
 	fprintf(stderr, "realloc of %p to %ld bytes at %s @%s;%d = ", ptr,
-			size, function, file, line);
+			(long)size, function, file, line);
 	ptr = realloc(ptr, size);
 	fprintf(stderr, "%p\n", ptr);
 	return ptr;
diff --git a/libc/stdlib/malloc/malloc.c b/libc/stdlib/malloc/malloc.c
index 432f893e8..9a3bbb332 100644
--- a/libc/stdlib/malloc/malloc.c
+++ b/libc/stdlib/malloc/malloc.c
@@ -54,8 +54,9 @@
  */
 
 #include <features.h>
-#define _POSIX_SOURCE
+#ifndef _XOPEN_SOURCE
 #define _XOPEN_SOURCE
+#endif
 #include <sys/types.h>
 #include <unistd.h>
 #include <limits.h>