diff --git a/src/rmodels.c b/src/rmodels.c
index 49f922695..9cfbcc7bd 100644
--- a/src/rmodels.c
+++ b/src/rmodels.c
@@ -3492,7 +3492,7 @@ void DrawBillboardRec(Camera camera, Texture2D texture, Rectangle source, Vector
 void DrawBillboardPro(Camera camera, Texture2D texture, Rectangle source, Vector3 position, Vector3 up, Vector2 size, Vector2 origin, float rotation, Color tint)
 {
     // NOTE: Billboard size will maintain source rectangle aspect ratio, size will represent billboard width
-    Vector2 sizeRatio = { size.x*(float)source.width/source.height, size.y };
+    Vector2 sizeRatio = { fabsf(size.x*(float)source.width/source.height), fabsf(size.y) };
 
     Matrix matView = MatrixLookAt(camera.position, camera.target, camera.up);