diff --git a/src/shapes.c b/src/shapes.c
index 0f5e4d5c9..343625dfd 100644
--- a/src/shapes.c
+++ b/src/shapes.c
@@ -1477,7 +1477,7 @@ bool CheckCollisionLines(Vector2 startPos1, Vector2 endPos1, Vector2 startPos2,
 
     if (div == 0.0f) return false;      // WARNING: This check could not work due to float precision rounding issues...
 
-    const float xi = ((startPos2.x - startPos2.x)*(startPos1.x*endPos1.y - startPos1.y*endPos1.x) - (startPos1.x - endPos1.x)*(startPos2.x*endPos2.y - startPos2.y*endPos2.x))/div;
+    const float xi = ((startPos2.x - endPos2.x)*(startPos1.x*endPos1.y - startPos1.y*endPos1.x) - (startPos1.x - endPos1.x)*(startPos2.x*endPos2.y - startPos2.y*endPos2.x))/div;
     const float yi = ((startPos2.y - endPos2.y)*(startPos1.x*endPos1.y - startPos1.y*endPos1.x) - (startPos1.y - endPos1.y)*(startPos2.x*endPos2.y - startPos2.y*endPos2.x))/div;
 
     if (xi < fminf(startPos1.x, endPos1.x) || xi > fmaxf(startPos1.x, endPos1.x)) return false;