diff --git a/test/built-ins/Promise/all/resolve-not-callable-close.js b/test/built-ins/Promise/all/resolve-not-callable-close.js
index c97895bd36..6d73880749 100644
--- a/test/built-ins/Promise/all/resolve-not-callable-close.js
+++ b/test/built-ins/Promise/all/resolve-not-callable-close.js
@@ -30,7 +30,7 @@ const iter = { 
   [Symbol.iterator]: function() {
     return {
       return: function() {
-        returnCount += 1;
+        ++returnCount;
       }
     };
   }
diff --git a/test/built-ins/Promise/allSettled/resolve-not-callable-close.js b/test/built-ins/Promise/allSettled/resolve-not-callable-close.js
index f3e6b0152e..598bba2ac7 100644
--- a/test/built-ins/Promise/allSettled/resolve-not-callable-close.js
+++ b/test/built-ins/Promise/allSettled/resolve-not-callable-close.js
@@ -27,7 +27,7 @@ const iter = { 
   [Symbol.iterator]: function() {
     return {
       return: function() {
-        returnCount += 1;
+        ++returnCount;
       }
     };
   }
diff --git a/test/built-ins/Promise/any/resolve-not-callable-close.js b/test/built-ins/Promise/any/resolve-not-callable-close.js
index 30eae98b66..24b4567f5e 100644
--- a/test/built-ins/Promise/any/resolve-not-callable-close.js
+++ b/test/built-ins/Promise/any/resolve-not-callable-close.js
@@ -27,7 +27,7 @@ const iter = { 
   [Symbol.iterator]: function() {
     return {
       return: function() {
-        returnCount += 1;
+        ++returnCount;
       }
     };
   }
diff --git a/test/built-ins/Promise/race/resolve-not-callable-close.js b/test/built-ins/Promise/race/resolve-not-callable-close.js
index 132928d3bd..991fa81401 100644
--- a/test/built-ins/Promise/race/resolve-not-callable-close.js
+++ b/test/built-ins/Promise/race/resolve-not-callable-close.js
@@ -30,7 +30,7 @@ const iter = { 
   [Symbol.iterator]: function() {
     return {
       return: function() {
-        returnCount += 1;
+        ++returnCount;
       }
     };
   }