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-rw-r--r--libcrystfel/src/statistics.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/libcrystfel/src/statistics.c b/libcrystfel/src/statistics.c
index 7990672d..83cac13c 100644
--- a/libcrystfel/src/statistics.c
+++ b/libcrystfel/src/statistics.c
@@ -14,6 +14,7 @@
#include <config.h>
#endif
+#define _ISOC99_SOURCE
#include <math.h>
#include <stdlib.h>
#include <gsl/gsl_errno.h>