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-rw-r--r--libcrystfel/src/detector.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/libcrystfel/src/detector.c b/libcrystfel/src/detector.c
index 54bae1d7..cf2cfbc9 100644
--- a/libcrystfel/src/detector.c
+++ b/libcrystfel/src/detector.c
@@ -11,6 +11,7 @@
*/
+#define _ISOC99_SOURCE
#include <stdlib.h>
#include <math.h>
#include <stdio.h>