diff --git a/test/compiler.jl b/test/compiler.jl
index 404644d5e..4df301878 100644
--- a/test/compiler.jl
+++ b/test/compiler.jl
@@ -624,7 +624,7 @@ end
         end
 
         s = @doc(demo)
-        @test "$s" == "This is a test\n"
+        @test string(s) == "This is a test\n"
 
         # Verify that adding docstring didn't completely break execution of model
         m = demo(0.)