diff --git a/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/declaration/FirConflictsChecker.kt b/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/declaration/FirConflictsChecker.kt
index df1e2979a77..77139b2ae29 100644
--- a/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/declaration/FirConflictsChecker.kt
+++ b/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/declaration/FirConflictsChecker.kt
@@ -84,7 +84,7 @@ object FirConflictsChecker : FirBasicDeclarationChecker() {
         ) {
             conflictingSymbol.ensureResolved(FirResolvePhase.STATUS)
             @OptIn(SymbolInternals::class)
-            val conflicting = conflictingSymbol.fir as? FirDeclaration ?: return
+            val conflicting = conflictingSymbol.fir
             if (declaration.moduleData != conflicting.moduleData) return
             val actualConflictingPresentation = conflictingPresentation ?: presenter.represent(conflicting)
             if (conflicting == declaration || actualConflictingPresentation != declarationPresentation) return
diff --git a/compiler/fir/providers/src/org/jetbrains/kotlin/fir/resolve/calls/Synthetics.kt b/compiler/fir/providers/src/org/jetbrains/kotlin/fir/resolve/calls/Synthetics.kt
index 9e913ecb976..1cf6268f50d 100644
--- a/compiler/fir/providers/src/org/jetbrains/kotlin/fir/resolve/calls/Synthetics.kt
+++ b/compiler/fir/providers/src/org/jetbrains/kotlin/fir/resolve/calls/Synthetics.kt
@@ -85,9 +85,9 @@ class FirSyntheticPropertiesScope(
         var matchingSetter: FirSimpleFunction? = null
         if (getterReturnType != null) {
             val setterName = syntheticNamesProvider.setterNameByGetterName(getterName)
-            baseScope.processFunctionsByName(setterName, fun(setterSymbol: FirFunctionSymbol<*>) {
+            baseScope.processFunctionsByName(setterName, fun(setterSymbol: FirNamedFunctionSymbol) {
                 if (matchingSetter != null) return
-                val setter = setterSymbol.fir as? FirSimpleFunction ?: return
+                val setter = setterSymbol.fir
                 val parameter = setter.valueParameters.singleOrNull() ?: return
                 if (setter.typeParameters.isNotEmpty() || setter.isStatic) return
                 val parameterType = (parameter.returnTypeRef as? FirResolvedTypeRef)?.type ?: return
diff --git a/compiler/fir/providers/src/org/jetbrains/kotlin/fir/scopes/impl/FirStaticScope.kt b/compiler/fir/providers/src/org/jetbrains/kotlin/fir/scopes/impl/FirStaticScope.kt
index 51c0a998418..c98f31397c4 100644
--- a/compiler/fir/providers/src/org/jetbrains/kotlin/fir/scopes/impl/FirStaticScope.kt
+++ b/compiler/fir/providers/src/org/jetbrains/kotlin/fir/scopes/impl/FirStaticScope.kt
@@ -5,8 +5,6 @@
 
 package org.jetbrains.kotlin.fir.scopes.impl
 
-import org.jetbrains.kotlin.fir.declarations.FirCallableDeclaration
-import org.jetbrains.kotlin.fir.declarations.FirSimpleFunction
 import org.jetbrains.kotlin.fir.declarations.utils.isStatic
 import org.jetbrains.kotlin.fir.resolve.substitution.ConeSubstitutor
 import org.jetbrains.kotlin.fir.scopes.FirContainingNamesAwareScope
@@ -22,7 +20,7 @@ class FirStaticScope(private val delegateScope: FirContainingNamesAwareScope) :
 
     override fun processFunctionsByName(name: Name, processor: (FirNamedFunctionSymbol) -> Unit) {
         delegateScope.processFunctionsByName(name) {
-            if ((it.fir as? FirSimpleFunction)?.isStatic == true) {
+            if (it.fir.isStatic) {
                 processor(it)
             }
         }
@@ -30,7 +28,7 @@ class FirStaticScope(private val delegateScope: FirContainingNamesAwareScope) :
 
     override fun processPropertiesByName(name: Name, processor: (FirVariableSymbol<*>) -> Unit) {
         delegateScope.processPropertiesByName(name) {
-            if ((it.fir as? FirCallableDeclaration)?.isStatic == true) {
+            if (it.fir.isStatic) {
                 processor(it)
             }
         }