diff --git a/src/field.c b/src/field.c
index 333ed6881028ef724361fa26b39195ba9f387a73..f07aad70862eee4dfebf49d92daf0d6faa7b5983 100644
--- a/src/field.c
+++ b/src/field.c
@@ -3,6 +3,7 @@
 #include <stdlib.h>
 
 #include "physics.h"
+#include "../utils/utils.h"
 
 
 // Compute E*qP/norm(qP)