diff --git a/src/Fable.Compiler/MSBuildCrackerResolver.fs b/src/Fable.Compiler/MSBuildCrackerResolver.fs
index 7ee26f8b3..ee81a3e97 100644
--- a/src/Fable.Compiler/MSBuildCrackerResolver.fs
+++ b/src/Fable.Compiler/MSBuildCrackerResolver.fs
@@ -99,10 +99,10 @@ module private MSBuildCrackerResolver =
                         failwith
                             $"""Failed to parse MSBuild output
 JSON:
-{targetFrameworkJson}
+%s{targetFrameworkJson}
 
 Exception:
-{ex}
+%O{ex}
 """
 
                 let tf, tfs =
@@ -161,10 +161,10 @@ Exception:
                     failwith
                         $"""Failed to parse MSBuild output
 JSON:
-{json}
+%s{json}
 
 Exception:
-{ex}
+%O{ex}
 """
 
             let items = jsonDocument.RootElement.GetProperty "Items"
diff --git a/src/Fable.Transforms/FSharp2Fable.fs b/src/Fable.Transforms/FSharp2Fable.fs
index 887d337e9..309da446a 100644
--- a/src/Fable.Transforms/FSharp2Fable.fs
+++ b/src/Fable.Transforms/FSharp2Fable.fs
@@ -565,7 +565,7 @@ let private transformUnionCaseTest
                 match fableType with
                 | Fable.Any ->
                     return
-                        $"Erased union case '{unionCase.Name}' is typed as 'obj' which cannot be tested at runtime (type test always evaluates to true). Use a more specific type or TypeScriptTaggedUnion instead."
+                        $"Erased union case '%s{unionCase.Name}' is typed as 'obj' which cannot be tested at runtime (type test always evaluates to true). Use a more specific type or TypeScriptTaggedUnion instead."
                         |> addErrorAndReturnNull com ctx.InlinePath r
                 | _ ->
                     let kind = fableType |> Fable.TypeTest