diff --git a/libraries/stdlib/src/generated/_Collections.kt b/libraries/stdlib/src/generated/_Collections.kt
index 0b0e2177bde..0ec0916bfe8 100644
--- a/libraries/stdlib/src/generated/_Collections.kt
+++ b/libraries/stdlib/src/generated/_Collections.kt
@@ -455,7 +455,7 @@ public fun <T> Iterable<T>.single(): T {
             val iterator = iterator()
             if (!iterator.hasNext())
                 throw NoSuchElementException("Collection is empty.")
-            var single = iterator.next()
+            val single = iterator.next()
             if (iterator.hasNext())
                 throw IllegalArgumentException("Collection has more than one element.")
             return single
@@ -501,7 +501,7 @@ public fun <T> Iterable<T>.singleOrNull(): T? {
             val iterator = iterator()
             if (!iterator.hasNext())
                 return null
-            var single = iterator.next()
+            val single = iterator.next()
             if (iterator.hasNext())
                 return null
             return single
diff --git a/libraries/stdlib/src/generated/_Sequences.kt b/libraries/stdlib/src/generated/_Sequences.kt
index 6cf3805d417..431411551a3 100644
--- a/libraries/stdlib/src/generated/_Sequences.kt
+++ b/libraries/stdlib/src/generated/_Sequences.kt
@@ -231,7 +231,7 @@ public fun <T> Sequence<T>.single(): T {
     val iterator = iterator()
     if (!iterator.hasNext())
         throw NoSuchElementException("Sequence is empty.")
-    var single = iterator.next()
+    val single = iterator.next()
     if (iterator.hasNext())
         throw IllegalArgumentException("Sequence has more than one element.")
     return single
@@ -261,7 +261,7 @@ public fun <T> Sequence<T>.singleOrNull(): T? {
     val iterator = iterator()
     if (!iterator.hasNext())
         return null
-    var single = iterator.next()
+    val single = iterator.next()
     if (iterator.hasNext())
         return null
     return single
diff --git a/libraries/tools/kotlin-stdlib-gen/src/templates/Elements.kt b/libraries/tools/kotlin-stdlib-gen/src/templates/Elements.kt
index d769f9d1ec1..2142a914023 100644
--- a/libraries/tools/kotlin-stdlib-gen/src/templates/Elements.kt
+++ b/libraries/tools/kotlin-stdlib-gen/src/templates/Elements.kt
@@ -620,7 +620,7 @@ fun elements(): List<GenericFunction> {
                     val iterator = iterator()
                     if (!iterator.hasNext())
                         throw NoSuchElementException("Collection is empty.")
-                    var single = iterator.next()
+                    val single = iterator.next()
                     if (iterator.hasNext())
                         throw IllegalArgumentException("Collection has more than one element.")
                     return single
@@ -633,7 +633,7 @@ fun elements(): List<GenericFunction> {
             val iterator = iterator()
             if (!iterator.hasNext())
                 throw NoSuchElementException("Sequence is empty.")
-            var single = iterator.next()
+            val single = iterator.next()
             if (iterator.hasNext())
                 throw IllegalArgumentException("Sequence has more than one element.")
             return single
@@ -661,7 +661,7 @@ fun elements(): List<GenericFunction> {
                     val iterator = iterator()
                     if (!iterator.hasNext())
                         return null
-                    var single = iterator.next()
+                    val single = iterator.next()
                     if (iterator.hasNext())
                         return null
                     return single
@@ -674,7 +674,7 @@ fun elements(): List<GenericFunction> {
             val iterator = iterator()
             if (!iterator.hasNext())
                 return null
-            var single = iterator.next()
+            val single = iterator.next()
             if (iterator.hasNext())
                 return null
             return single