diff --git a/CPP/Clipper2Lib/src/clipper.engine.cpp b/CPP/Clipper2Lib/src/clipper.engine.cpp
index dc2a597a..9ac02073 100644
--- a/CPP/Clipper2Lib/src/clipper.engine.cpp
+++ b/CPP/Clipper2Lib/src/clipper.engine.cpp
@@ -1121,12 +1121,12 @@ namespace Clipper2Lib {
   inline bool IsCollinear(const Point64& pt1, 
     const Point64& sharedPt, const Point64& pt2) // #777
   {
-#ifdef __aarch64__
-    double cp = CrossProduct(pt1, sharedPt, pt2);
-    return std::fabs(cp) < 0.00000001;
-#else
+//#ifdef __aarch64__
+//    double cp = CrossProduct(pt1, sharedPt, pt2);
+//    return std::fabs(cp) < 0.00000001;
+//#else
     return CrossProduct(pt1, sharedPt, pt2) == 0;
-#endif
+//#endif
   }
 
   bool IsValidAelOrder(const Active& resident, const Active& newcomer)