diff --git a/numpy/core/src/multiarray/convert.c b/numpy/core/src/multiarray/convert.c

index 29a2bb0e8..77aa72033 100644

--- a/numpy/core/src/multiarray/convert.c

+++ b/numpy/core/src/multiarray/convert.c

@@ -20,8 +20,8 @@

 #include "convert.h"

-int

-fallocate(int fd, int mode, off_t offset, off_t len);

+#define _GNU_SOURCE             /* See feature_test_macros(7) */

+#include <fcntl.h>

 /*

  * allocate nbytes of diskspace for file fp