diff --git a/src/Compilers/Core/Portable/DiagnosticAnalyzer/AnalyzerManager.AnalyzerExecutionContext.cs b/src/Compilers/Core/Portable/DiagnosticAnalyzer/AnalyzerManager.AnalyzerExecutionContext.cs
index 5771747eafa631ec03a450827d4539ef13dae099..2ebdcd7e78b3069b35dac85147ea0b7a6d4029bd 100644
--- a/src/Compilers/Core/Portable/DiagnosticAnalyzer/AnalyzerManager.AnalyzerExecutionContext.cs
+++ b/src/Compilers/Core/Portable/DiagnosticAnalyzer/AnalyzerManager.AnalyzerExecutionContext.cs
@@ -187,7 +187,7 @@ void processMembers(IEnumerable<ISymbol> members)
             }
 
             [Conditional("DEBUG")]
-            void VerifyNewEntryForPendingMemberSymbolsMap(ISymbol symbol, HashSet<ISymbol> dependentSymbols)
+            private void VerifyNewEntryForPendingMemberSymbolsMap(ISymbol symbol, HashSet<ISymbol> dependentSymbols)
             {
                 if (_lazyPendingMemberSymbolsMapOpt.TryGetValue(symbol, out var existingDependentSymbols))
                 {