diff --git a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/symbols/impl/FirCallableSymbol.kt b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/symbols/impl/FirCallableSymbol.kt
index 7767e582c79..d8ea272aeb3 100644
--- a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/symbols/impl/FirCallableSymbol.kt
+++ b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/symbols/impl/FirCallableSymbol.kt
@@ -67,5 +67,5 @@ val FirCallableSymbol<*>.isExtension: Boolean
     get() = when (fir) {
         is FirFunction -> fir.receiverTypeRef != null
         is FirProperty -> fir.receiverTypeRef != null
-        else -> false
+        is FirVariable -> false
     }