diff --git a/source/core/maptypes.h b/source/core/maptypes.h
index 4ce0ebba4..20e1e883c 100644
--- a/source/core/maptypes.h
+++ b/source/core/maptypes.h
@@ -722,5 +722,5 @@ constexpr DAngle mapangle(int mapang)
 }
 inline DAngle maphoriz(double maphoriz)
 {
-	return DAngle::fromDeg(atan2(maphoriz, 128.) * (180. / pi::pi()));
+	return DAngle::fromDeg(g_atan2(maphoriz, 128.) * (180. / pi::pi()));
 }