diff --git a/programs/level.c b/programs/level.c
index 873ff1d..aa8b83e 100644
--- a/programs/level.c
+++ b/programs/level.c
@@ -194,7 +194,7 @@ void draw()
 
   S3L_Vec4 screenPoint;
 
-  project3DPointToScreen(teleportPoint,scene.camera,&screenPoint);
+  S3L_project3DPointToScreen(teleportPoint,scene.camera,&screenPoint);
 
   if (screenPoint.w > 0 && 
       screenPoint.x >= 0 && screenPoint.x < S3L_resolutionX &&
diff --git a/small3dlib.h b/small3dlib.h
index b620295..b39517b 100644
--- a/small3dlib.h
+++ b/small3dlib.h
@@ -635,7 +635,7 @@ S3L_Unit S3L_sqrt(S3L_Unit value);
   can be useful e.g. for drawing sprites. The w component of input and result
   holds the point size. If this size is 0 in the result, the sprite is outside
   the view. */
-void project3DPointToScreen(
+void S3L_project3DPointToScreen(
   S3L_Vec4 point,
   S3L_Camera camera,
   S3L_Vec4 *result);
@@ -1625,7 +1625,7 @@ static inline void S3L_perspectiveDivide(S3L_Vec4 *vector,
   vector->y = (vector->y * focalLength) / vector->z;
 }
 
-void project3DPointToScreen(
+void S3L_project3DPointToScreen(
   S3L_Vec4 point,
   S3L_Camera camera,
   S3L_Vec4 *result)