diff --git a/lib/CSSStyleDeclaration.js b/lib/CSSStyleDeclaration.js
index a451cf9e..6d430623 100644
--- a/lib/CSSStyleDeclaration.js
+++ b/lib/CSSStyleDeclaration.js
@@ -391,7 +391,7 @@ Object.defineProperties(CSSStyleDeclaration.prototype, {
         return;
       }
       let originalText = "";
-      if (typeof this._onChange === "function") {
+      if (typeof this._onChange === "function" && !this._setInProgress) {
         originalText = this.cssText;
       }
       if (this._values.has(property)) {
@@ -414,8 +414,8 @@ Object.defineProperties(CSSStyleDeclaration.prototype, {
       this._values.set(property, val);
       if (
         typeof this._onChange === "function" &&
-        this.cssText !== originalText &&
-        !this._setInProgress
+        !this._setInProgress &&
+        this.cssText !== originalText
       ) {
         this._onChange(this.cssText);
       }