diff --git a/compiler/fir/lightTree/src/org/jetbrains/kotlin/fir/lightTree/converter/DeclarationsConverter.kt b/compiler/fir/lightTree/src/org/jetbrains/kotlin/fir/lightTree/converter/DeclarationsConverter.kt
index 2563858c372..44ec064f3ef 100644
--- a/compiler/fir/lightTree/src/org/jetbrains/kotlin/fir/lightTree/converter/DeclarationsConverter.kt
+++ b/compiler/fir/lightTree/src/org/jetbrains/kotlin/fir/lightTree/converter/DeclarationsConverter.kt
@@ -1268,6 +1268,8 @@ class DeclarationsConverter(
         firTypeParameter.annotations += typeParameterModifiers.annotations
         firType?.let { firTypeParameter.bounds += it }
 
+        firTypeParameter.addDefaultBoundIfNecessary()
+
         return firTypeParameter
     }