diff --git a/plugins/terminal/src/org/jetbrains/plugins/terminal/block/prompt/TerminalPromptModelImpl.kt b/plugins/terminal/src/org/jetbrains/plugins/terminal/block/prompt/TerminalPromptModelImpl.kt
index 13e29759dc49..5f7659b84c77 100644
--- a/plugins/terminal/src/org/jetbrains/plugins/terminal/block/prompt/TerminalPromptModelImpl.kt
+++ b/plugins/terminal/src/org/jetbrains/plugins/terminal/block/prompt/TerminalPromptModelImpl.kt
@@ -96,7 +96,7 @@ internal class TerminalPromptModelImpl(
   @RequiresEdt
   private fun doUpdatePrompt(renderingInfo: TerminalPromptRenderingInfo) {
     DocumentUtil.writeInRunUndoTransparentAction {
-      document.guardedBlocks.forEach { document.removeGuardedBlock(it) }
+      document.clearGuardedBlocks()
       document.replaceString(0, commandStartOffset, renderingInfo.text)
       document.createGuardedBlock(0, renderingInfo.text.length)
     }
@@ -175,5 +175,9 @@ internal class TerminalPromptModelImpl(
       addRangeHighlighter(highlighting.startOffset, highlighting.endOffset, HighlighterLayer.SYNTAX,
                           highlighting.textAttributesProvider.getTextAttributes(), HighlighterTargetArea.EXACT_RANGE)
     }
+
+    private fun DocumentEx.clearGuardedBlocks() {
+      this.guardedBlocks.forEach { removeGuardedBlock(it) }
+    }
   }
 }
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