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-rw-r--r--libcrystfel/src/image-cbf.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/libcrystfel/src/image-cbf.c b/libcrystfel/src/image-cbf.c
index 0011ac69..c2a4e9cb 100644
--- a/libcrystfel/src/image-cbf.c
+++ b/libcrystfel/src/image-cbf.c
@@ -35,6 +35,7 @@
#include <math.h>
#include <stdio.h>
#include <zlib.h>
+#include <unistd.h>
#include "image.h"
#include "utils.h"