diff --git a/Test.hx b/Test.hx
index 6693e0e..35fba99 100644
--- a/Test.hx
+++ b/Test.hx
@@ -30,6 +30,7 @@ class Test {
 		test("0 < 0",false);
 		test("-1 <= -1",true);
 		test("1 + 2",3);
+		test("~545",-546);
 		test("'abc' + 55","abc55");
 		test("'abc' + 'de'","abcde");
 		test("-1 + 2",1);
diff --git a/hscript/Interp.hx b/hscript/Interp.hx
index f593a8e..611fe7e 100644
--- a/hscript/Interp.hx
+++ b/hscript/Interp.hx
@@ -246,6 +246,12 @@ class Interp {
 				return increment(e,prefix,1);
 			case "--":
 				return increment(e,prefix,-1);
+			case "~":
+				#if neko
+				return haxe.Int32.complement(expr(e));
+				#else
+				return ~expr(e);
+				#end
 			default:
 				throw Error.EInvalidOp(op);
 			}
diff --git a/hscript/Parser.hx b/hscript/Parser.hx
index 1f9ebf5..4268cb1 100644
--- a/hscript/Parser.hx
+++ b/hscript/Parser.hx
@@ -61,7 +61,7 @@ class Parser {
 
 	public function new() {
 		line = 1;
-		opChars = "+*/-=!><&|^%";
+		opChars = "+*/-=!><&|^%~";
 		identChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_";
 		opPriority = [
 			"...",
@@ -74,7 +74,7 @@ class Parser {
 			"*","/",
 			"%"
 		];
-		unopsPrefix = ["!","++","--","-"];
+		unopsPrefix = ["!","++","--","-","~"];
 		unopsSuffix = ["++","--"];
 	}