diff --git a/javascript/qrcodegen.js b/javascript/qrcodegen.js
index 0fd17ad..13d7abf 100644
--- a/javascript/qrcodegen.js
+++ b/javascript/qrcodegen.js
@@ -398,7 +398,8 @@ var qrcodegen = new function() {
 						case 7:  invert = ((x + y) % 2 + x * y % 3) % 2 == 0;                break;
 						default:  throw "Assertion error";
 					}
-					modules[y][x] ^= invert & !isFunction[y][x];
+					if (!isFunction[y][x] && invert)
+						modules[y][x] = !modules[y][x];
 				}
 			}
 		}
diff --git a/typescript/qrcodegen.ts b/typescript/qrcodegen.ts
index b975987..3ab5c8b 100644
--- a/typescript/qrcodegen.ts
+++ b/typescript/qrcodegen.ts
@@ -470,7 +470,7 @@ namespace qrcodegen {
 						case 7:  invert = ((x + y) % 2 + x * y % 3) % 2 == 0;                break;
 						default:  throw "Assertion error";
 					}
-					if (invert && !this.isFunction[y][x])
+					if (!this.isFunction[y][x] && invert)
 						this.modules[y][x] = !this.modules[y][x];
 				}
 			}