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-rw-r--r--tests/pr_gradient_check.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/tests/pr_gradient_check.c b/tests/pr_gradient_check.c
index 6972b66a..b39dfd05 100644
--- a/tests/pr_gradient_check.c
+++ b/tests/pr_gradient_check.c
@@ -32,6 +32,7 @@
#include <image.h>
#include <cell.h>
+#include <cell-utils.h>
#include <geometry.h>
#include <reflist.h>
#include "../src/post-refinement.h"