diff --git a/compiler/fir/raw-fir/light-tree2fir/src/org/jetbrains/kotlin/fir/lightTree/fir/ValueParameter.kt b/compiler/fir/raw-fir/light-tree2fir/src/org/jetbrains/kotlin/fir/lightTree/fir/ValueParameter.kt
index 031eba0172b..fad51108fcd 100644
--- a/compiler/fir/raw-fir/light-tree2fir/src/org/jetbrains/kotlin/fir/lightTree/fir/ValueParameter.kt
+++ b/compiler/fir/raw-fir/light-tree2fir/src/org/jetbrains/kotlin/fir/lightTree/fir/ValueParameter.kt
@@ -85,7 +85,9 @@ class ValueParameter(
                 modifiers.getVisibility()
             ) else null
         }.apply {
-            this.isFromVararg = firValueParameter.isVararg
+            if (firValueParameter.isVararg) {
+                this.isFromVararg = true
+            }
         }
     }
 }
diff --git a/compiler/fir/raw-fir/psi2fir/src/org/jetbrains/kotlin/fir/builder/RawFirBuilder.kt b/compiler/fir/raw-fir/psi2fir/src/org/jetbrains/kotlin/fir/builder/RawFirBuilder.kt
index 2b9a2e5556d..cdb796dca85 100644
--- a/compiler/fir/raw-fir/psi2fir/src/org/jetbrains/kotlin/fir/builder/RawFirBuilder.kt
+++ b/compiler/fir/raw-fir/psi2fir/src/org/jetbrains/kotlin/fir/builder/RawFirBuilder.kt
@@ -463,7 +463,9 @@ open class RawFirBuilder(
 
                 dispatchReceiverType = currentDispatchReceiverType()
             }.apply {
-                isFromVararg = firParameter.isVararg
+                if (firParameter.isVararg) {
+                    isFromVararg = true
+                }
             }
         }