diff --git a/src/engine/engine_collision_gjk.c b/src/engine/engine_collision_gjk.c
index 8e57d12c..b88d861e 100644
--- a/src/engine/engine_collision_gjk.c
+++ b/src/engine/engine_collision_gjk.c
@@ -1828,7 +1828,7 @@ static int meshEdgeNormals(mjtNum* res, mjtNum* endverts, int dim, mjCCDObj* obj
         }
       }
     }
-    return 3;
+    return v1_num;
   }
   return 0;
 }