diff --git a/src/Features/Core/Portable/Completion/CompletionService.cs b/src/Features/Core/Portable/Completion/CompletionService.cs
index 6ecbfa300daf4..af9865823b7b9 100644
--- a/src/Features/Core/Portable/Completion/CompletionService.cs
+++ b/src/Features/Core/Portable/Completion/CompletionService.cs
@@ -212,7 +212,7 @@ public virtual TextSpan GetDefaultCompletionListSpan(SourceText text, int caretP
         if (provider is null)
             return CompletionDescription.Empty;
 
-        var extensionManager = document.Project.Solution.Workspace.Services.GetRequiredService<IExtensionManager>();
+        var extensionManager = document.Project.Solution.Services.GetRequiredService<IExtensionManager>();
 
         // We don't need SemanticModel here, just want to make sure it won't get GC'd before CompletionProviders are able to get it.
         (document, var semanticModel) = await GetDocumentWithFrozenPartialSemanticsAsync(document, cancellationToken).ConfigureAwait(false);
@@ -243,7 +243,7 @@ public virtual async Task<CompletionChange> GetChangeAsync(
         var provider = GetProvider(item, document.Project);
         if (provider != null)
         {
-            var extensionManager = document.Project.Solution.Workspace.Services.GetRequiredService<IExtensionManager>();
+            var extensionManager = document.Project.Solution.Services.GetRequiredService<IExtensionManager>();
 
             // We don't need SemanticModel here, just want to make sure it won't get GC'd before CompletionProviders are able to get it.
             (document, var semanticModel) = await GetDocumentWithFrozenPartialSemanticsAsync(document, cancellationToken).ConfigureAwait(false);
diff --git a/src/Features/Core/Portable/Completion/CompletionService_GetCompletions.cs b/src/Features/Core/Portable/Completion/CompletionService_GetCompletions.cs
index c289508ca54d5..f65263b38a224 100644
--- a/src/Features/Core/Portable/Completion/CompletionService_GetCompletions.cs
+++ b/src/Features/Core/Portable/Completion/CompletionService_GetCompletions.cs
@@ -151,7 +151,7 @@ ImmutableArray<CompletionProvider> GetTriggeredProviders(
         static async Task<ImmutableArray<CompletionProvider>> GetAugmentingProvidersAsync(
             Document document, ImmutableArray<CompletionProvider> triggeredProviders, int caretPosition, CompletionTrigger trigger, CompletionOptions options, CancellationToken cancellationToken)
         {
-            var extensionManager = document.Project.Solution.Workspace.Services.GetRequiredService<IExtensionManager>();
+            var extensionManager = document.Project.Solution.Services.GetRequiredService<IExtensionManager>();
             var additionalAugmentingProviders = ArrayBuilder<CompletionProvider>.GetInstance(triggeredProviders.Length);
             if (trigger.Kind == CompletionTriggerKind.Insertion)
             {
@@ -327,7 +327,7 @@ private static async Task<CompletionContext> GetContextAsync(
         SharedSyntaxContextsWithSpeculativeModel? sharedContext,
         CancellationToken cancellationToken)
     {
-        var extensionManager = document.Project.Solution.Workspace.Services.GetRequiredService<IExtensionManager>();
+        var extensionManager = document.Project.Solution.Services.GetRequiredService<IExtensionManager>();
 
         var context = new CompletionContext(provider, document, position, sharedContext, defaultSpan, triggerInfo, options, cancellationToken);