diff --git a/libraries/stdlib/src/kotlin/text/StringBuilder.kt b/libraries/stdlib/src/kotlin/text/StringBuilder.kt
index 0d5d16cc25d..b2996b3ba84 100644
--- a/libraries/stdlib/src/kotlin/text/StringBuilder.kt
+++ b/libraries/stdlib/src/kotlin/text/StringBuilder.kt
@@ -9,6 +9,12 @@ package kotlin.text
 @kotlin.internal.InlineOnly
 public inline fun buildString(builderAction: StringBuilder.() -> Unit): String = StringBuilder().apply(builderAction).toString()
 
+/**
+ * Builds new string by populating newly created [StringBuilder] initialized with the given capacity using provided [builderAction] and then converting it to [String].
+ */
+@kotlin.internal.InlineOnly
+inline fun buildString(capacity : Int, builderAction: StringBuilder.() -> Unit): String = StringBuilder(capacity).apply(builderAction).toString()
+
 /**
  * Appends all arguments to the given [Appendable].
  */
diff --git a/libraries/stdlib/test/text/StringBuilderJVMTest.kt b/libraries/stdlib/test/text/StringBuilderJVMTest.kt
index 4bd41acab5a..3e5ae4c2fc5 100644
--- a/libraries/stdlib/test/text/StringBuilderJVMTest.kt
+++ b/libraries/stdlib/test/text/StringBuilderJVMTest.kt
@@ -5,6 +5,13 @@ import kotlin.test.*
 import org.junit.Test as test
 
 class StringBuilderJVMTest() {
+
+    @test fun stringBuildWithInitialCapacity() {
+        val s = buildString(123) {
+            assertEquals(123, capacity())
+        }
+    }
+
     @test fun getAndSetChar() {
         val sb = StringBuilder("abc")
         sb[1] = 'z'