diff --git a/libraries/stdlib/api/js-v1/kotlin.text.kt b/libraries/stdlib/api/js-v1/kotlin.text.kt
index 8427d46b1cf..795c75f3bbd 100644
--- a/libraries/stdlib/api/js-v1/kotlin.text.kt
+++ b/libraries/stdlib/api/js-v1/kotlin.text.kt
@@ -1505,7 +1505,7 @@ public final class StringBuilder : kotlin.text.Appendable, kotlin.CharSequence {
     public final fun appendRange(value: kotlin.CharSequence, startIndex: kotlin.Int, endIndex: kotlin.Int): kotlin.text.StringBuilder
 
     @kotlin.SinceKotlin(version = "1.3")
-    @kotlin.Deprecated(level = DeprecationLevel.ERROR, message = "Obtaining StringBuilder capacity is not supported in JS and common code.")
+    @kotlin.Deprecated(level = DeprecationLevel.WARNING, message = "Obtaining StringBuilder capacity is not supported in JS and common code.")
     public final fun capacity(): kotlin.Int
 
     @kotlin.SinceKotlin(version = "1.3")
diff --git a/libraries/stdlib/api/js/kotlin.text.kt b/libraries/stdlib/api/js/kotlin.text.kt
index 8427d46b1cf..795c75f3bbd 100644
--- a/libraries/stdlib/api/js/kotlin.text.kt
+++ b/libraries/stdlib/api/js/kotlin.text.kt
@@ -1505,7 +1505,7 @@ public final class StringBuilder : kotlin.text.Appendable, kotlin.CharSequence {
     public final fun appendRange(value: kotlin.CharSequence, startIndex: kotlin.Int, endIndex: kotlin.Int): kotlin.text.StringBuilder
 
     @kotlin.SinceKotlin(version = "1.3")
-    @kotlin.Deprecated(level = DeprecationLevel.ERROR, message = "Obtaining StringBuilder capacity is not supported in JS and common code.")
+    @kotlin.Deprecated(level = DeprecationLevel.WARNING, message = "Obtaining StringBuilder capacity is not supported in JS and common code.")
     public final fun capacity(): kotlin.Int
 
     @kotlin.SinceKotlin(version = "1.3")
diff --git a/libraries/stdlib/js/src/kotlin/text/StringBuilderJs.kt b/libraries/stdlib/js/src/kotlin/text/StringBuilderJs.kt
index 9eb73d741d3..f680fc6220a 100644
--- a/libraries/stdlib/js/src/kotlin/text/StringBuilderJs.kt
+++ b/libraries/stdlib/js/src/kotlin/text/StringBuilderJs.kt
@@ -132,7 +132,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      */
     @SinceKotlin("1.3")
 //    @ExperimentalStdlibApi
-    @Deprecated("Obtaining StringBuilder capacity is not supported in JS and common code.", level = DeprecationLevel.ERROR)
+    @Deprecated("Obtaining StringBuilder capacity is not supported in JS and common code.", level = DeprecationLevel.WARNING)
     actual fun capacity(): Int = length
 
     /**