diff --git a/src/unittest/test_noderesolver.cpp b/src/unittest/test_noderesolver.cpp
index a4ea647bc..bd6e6f5ac 100644
--- a/src/unittest/test_noderesolver.cpp
+++ b/src/unittest/test_noderesolver.cpp
@@ -19,6 +19,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 #include "test.h"
 
+#include "util/numeric.h"
 #include "exceptions.h"
 #include "gamedef.h"
 #include "nodedef.h"