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-rw-r--r--libcrystfel/src/statistics.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/libcrystfel/src/statistics.c b/libcrystfel/src/statistics.c
index 56273fdb..ccf35194 100644
--- a/libcrystfel/src/statistics.c
+++ b/libcrystfel/src/statistics.c
@@ -30,7 +30,6 @@
#include <config.h>
#endif
-#define _ISOC99_SOURCE
#include <math.h>
#include <stdlib.h>
#include <gsl/gsl_errno.h>