diff --git a/src/core/FileLoader.cpp b/src/core/FileLoader.cpp
index 4662b508..cdf31f7b 100644
--- a/src/core/FileLoader.cpp
+++ b/src/core/FileLoader.cpp
@@ -679,7 +679,7 @@ CFileLoader::LoadMLOInstance(int id, const char *line)
 		&scale.x, &scale.y, &scale.z,
 		&rot.x, &rot.y, &rot.z,
 		&angle);
-	float rad = 2.0f * (PI / 2.0f - atan2(angle, sqrt(1.0f - SQR(angle))));
+	float rad = 2.0f * (PI / 2.0f - Atan2(angle, Sqrt(1.0f - SQR(angle))));
 	CInstance *inst = CModelInfo::GetMloInstanceStore()->alloc();
 	minfo->lastInstance++;