diff --git a/std/haxe/Int64.hx b/std/haxe/Int64.hx
index 4bebe90675a..25896103956 100644
--- a/std/haxe/Int64.hx
+++ b/std/haxe/Int64.hx
@@ -229,34 +229,30 @@ abstract Int64(__Int64) from __Int64 to __Int64 {
 
 	@:op(++A) private inline function preIncrement():Int64 {
 		this = copy();
-		++this.low;
+		this.low++;
 		if (this.low == 0)
-			++this.high;
+			this.high++;
 		return cast this;
 	}
 
 	@:op(A++) private inline function postIncrement():Int64 {
-		this = copy();
-		this.low++;
-		if (this.low == 0)
-			this.high++;
-		return cast this;
+		var ret = this;
+		preIncrement();
+		return ret;
 	}
 
 	@:op(--A) private inline function preDecrement():Int64 {
 		this = copy();
 		if (this.low == 0)
-			--this.high;
-		--this.low;
+			this.high--;
+		this.low--;
 		return cast this;
 	}
 
 	@:op(A--) private inline function postDecrement():Int64 {
-		this = copy();
-		if (this.low == 0)
-			this.high--;
-		this.low--;
-		return cast this;
+		var ret = this;
+		preDecrement();
+		return ret;
 	}
 
 	/**