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-rw-r--r--src/slope_func.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/slope_func.h b/src/slope_func.h
index 4a68f6713..507650552 100644
--- a/src/slope_func.h
+++ b/src/slope_func.h
@@ -5,6 +5,7 @@
#ifndef SLOPE_FUNC_H
#define SLOPE_FUNC_H
+#include "core/math_func.hpp"
#include "slope_type.h"
#include "direction_type.h"