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-rw-r--r--libcrystfel/src/image.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/libcrystfel/src/image.c b/libcrystfel/src/image.c
index 7bb4cede..09f4958d 100644
--- a/libcrystfel/src/image.c
+++ b/libcrystfel/src/image.c
@@ -27,7 +27,6 @@
*
*/
-#define _ISOC99_SOURCE
#include <stdlib.h>
#include <assert.h>
#include <math.h>