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-rw-r--r--extension/inplace.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/extension/inplace.c b/extension/inplace.c
index 5457287f..ecc3afdc 100644
--- a/extension/inplace.c
+++ b/extension/inplace.c
@@ -28,7 +28,7 @@
#endif
#ifndef _XOPEN_SOURCE
-# define _XOPEN_SOURCE
+# define _XOPEN_SOURCE 1
#endif
#ifndef _XOPEN_SOURCE_EXTENDED
# define _XOPEN_SOURCE_EXTENDED 1