diff --git a/idea/idea-jvm/src/com/intellij/debugger/streams/kotlin/trace/dsl/KotlinMapVariable.kt b/idea/idea-jvm/src/com/intellij/debugger/streams/kotlin/trace/dsl/KotlinMapVariable.kt
index 3c995ee9116..1a3b1228d89 100644
--- a/idea/idea-jvm/src/com/intellij/debugger/streams/kotlin/trace/dsl/KotlinMapVariable.kt
+++ b/idea/idea-jvm/src/com/intellij/debugger/streams/kotlin/trace/dsl/KotlinMapVariable.kt
@@ -15,7 +15,7 @@ class KotlinMapVariable(type: MapType, name: String) : MapVariableBase(type, nam
   override fun set(key: Expression, newValue: Expression): Expression =
     TextExpression("${toCode()}[${key.toCode()}] = ${newValue.toCode()}")
 
-  override fun contains(key: Expression): Expression = TextExpression("${key.toCode()} in ${toCode()}")
+  override fun contains(key: Expression): Expression = TextExpression("(${key.toCode()} in ${toCode()})")
 
   override fun size(): Expression = TextExpression("${toCode()}.size")
 
diff --git a/idea/testData/debugger/sequence/dsl/mapContains.out b/idea/testData/debugger/sequence/dsl/mapContains.out
index 01bfed93a00..1576a23663a 100644
--- a/idea/testData/debugger/sequence/dsl/mapContains.out
+++ b/idea/testData/debugger/sequence/dsl/mapContains.out
@@ -1 +1 @@
-key in map
+(key in map)