diff --git a/analyzers/src/SonarAnalyzer.CSharp/Rules/RedundantInheritanceList.cs b/analyzers/src/SonarAnalyzer.CSharp/Rules/RedundantInheritanceList.cs
index a31a30663b7..6f22d0e1066 100644
--- a/analyzers/src/SonarAnalyzer.CSharp/Rules/RedundantInheritanceList.cs
+++ b/analyzers/src/SonarAnalyzer.CSharp/Rules/RedundantInheritanceList.cs
@@ -145,9 +145,7 @@ private static INamedTypeSymbol CollidingDeclaration(INamedTypeSymbol declaredTy
 
         private static bool CanInterfaceBeRemovedBasedOnMembers(INamedTypeSymbol declaredType, INamedTypeSymbol interfaceType)
         {
-            var allMembersOfInterface = AllInterfacesAndSelf(interfaceType)
-                .SelectMany(x => x.GetMembers())
-                .ToList();
+            var allMembersOfInterface = AllInterfacesAndSelf(interfaceType).SelectMany(x => x.GetMembers()).ToImmutableArray();
 
             if (!allMembersOfInterface.Any())
             {