diff --git a/src/map_location.cpp b/src/map_location.cpp
index 3d0544e56c69..dee602c2c26b 100644
--- a/src/map_location.cpp
+++ b/src/map_location.cpp
@@ -176,6 +176,11 @@ map_location map_location::get_direction(
 	}
 }
 
+map_location::DIRECTION map_location::get_relative_dir(const map_location & loc) const
+{
+	return get_relative_dir(loc, map_location::DEFAULT);
+}
+
 map_location::DIRECTION map_location::get_relative_dir(const map_location & loc, map_location::RELATIVE_DIR_MODE opt) const
 {
 	if (opt == map_location::DEFAULT) {
diff --git a/src/map_location.hpp b/src/map_location.hpp
index 4e8053e3fdcd..9e30682c894d 100644
--- a/src/map_location.hpp
+++ b/src/map_location.hpp
@@ -96,7 +96,8 @@ struct map_location {
 	map_location get_direction(DIRECTION d, int n = 1) const;
 
 	enum RELATIVE_DIR_MODE { DEFAULT , RADIAL_SYMMETRY };
-	DIRECTION get_relative_dir(const map_location & loc, map_location::RELATIVE_DIR_MODE mode = map_location::DEFAULT ) const;
+	DIRECTION get_relative_dir(const map_location & loc, map_location::RELATIVE_DIR_MODE mode /*= map_location::RADIAL_SYMMETRY*/ ) const;
+	DIRECTION get_relative_dir(const map_location & loc) const; //moved the default setting to .cpp file for ease of testing
 
 	// Express as a vector in the basis N, NE. N, and NE may be obtained by zero.get_direction(NORTH), ...(NORTH_EAST), respectively.
 	std::pair<int,int> get_in_basis_N_NE() const;