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-rw-r--r--libcrystfel/src/asdf.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/libcrystfel/src/asdf.c b/libcrystfel/src/asdf.c
index 49917ad9..033688ba 100644
--- a/libcrystfel/src/asdf.c
+++ b/libcrystfel/src/asdf.c
@@ -28,8 +28,6 @@
*
*/
-#define _ISOC99_SOURCE
-
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif