diff --git a/src/FSharp.Analyzers.SDK.Testing/FSharp.Analyzers.SDK.Testing.fs b/src/FSharp.Analyzers.SDK.Testing/FSharp.Analyzers.SDK.Testing.fs
index fd1bd5f..8c29e2d 100644
--- a/src/FSharp.Analyzers.SDK.Testing/FSharp.Analyzers.SDK.Testing.fs
+++ b/src/FSharp.Analyzers.SDK.Testing/FSharp.Analyzers.SDK.Testing.fs
@@ -213,8 +213,8 @@ let mkOptionsFromProject (framework: string) (additionalPkgs: Package list) =
             return FSharpProjectOptions.zero
     }
 
-let getContext (opts: FSharpProjectOptions) source =
-    let fileName = "A.fs"
+let getContextFor (opts: FSharpProjectOptions) isSignature source =
+    let fileName = if isSignature then "A.fsi" else "A.fs"
     let files = Map.ofArray [| (fileName, SourceText.ofString source) |]
 
     let documentSource fileName =
@@ -260,6 +260,9 @@ let getContext (opts: FSharpProjectOptions) source =
         Utils.createContext checkProjectResults fileName sourceText (parseFileResults, checkFileResults)
     | None -> failwith "typechecking file failed"
 
+let getContext (opts: FSharpProjectOptions) source = getContextFor opts false source
+let getContextForSignature (opts: FSharpProjectOptions) source = getContextFor opts true source
+
 module Assert =
 
     let hasWarningsInLines (expectedLines: Set<int>) (msgs: FSharp.Analyzers.SDK.Message list) =
diff --git a/src/FSharp.Analyzers.SDK.Testing/FSharp.Analyzers.SDK.Testing.fsi b/src/FSharp.Analyzers.SDK.Testing/FSharp.Analyzers.SDK.Testing.fsi
index ad842d0..97c278c 100644
--- a/src/FSharp.Analyzers.SDK.Testing/FSharp.Analyzers.SDK.Testing.fsi
+++ b/src/FSharp.Analyzers.SDK.Testing/FSharp.Analyzers.SDK.Testing.fsi
@@ -19,6 +19,7 @@ exception CompilerDiagnosticErrors of FSharpDiagnostic array
 val mkOptionsFromProject: framework: string -> additionalPkgs: Package list -> Task<FSharpProjectOptions>
 
 val getContext: opts: FSharpProjectOptions -> source: string -> CliContext
+val getContextForSignature: opts: FSharpProjectOptions -> source: string -> CliContext
 
 module Assert =
 
diff --git a/src/FSharp.Analyzers.SDK/ASTCollecting.fs b/src/FSharp.Analyzers.SDK/ASTCollecting.fs
index 552af4c..9194e24 100644
--- a/src/FSharp.Analyzers.SDK/ASTCollecting.fs
+++ b/src/FSharp.Analyzers.SDK/ASTCollecting.fs
@@ -586,7 +586,7 @@ module ASTCollecting =
             match decl with
             | SynModuleSigDecl.ModuleAbbrev _ -> ()
             | SynModuleSigDecl.NestedModule _ -> ()
-            | SynModuleSigDecl.Val(s, _range) -> walker.WalkValSig s
+            | SynModuleSigDecl.Val(s, _range) -> walkValSig s
             | SynModuleSigDecl.Types _ -> ()
             | SynModuleSigDecl.Exception _ -> ()
             | SynModuleSigDecl.Open _ -> ()