diff --git a/test/Feature/RpcSpec.hs b/test/Feature/RpcSpec.hs
index c6c9ce7db..b0fc0f7ae 100644
--- a/test/Feature/RpcSpec.hs
+++ b/test/Feature/RpcSpec.hs
@@ -494,6 +494,11 @@ spec actualPgVersion =
         liftIO $ do
           simpleStatus p `shouldBe` badRequest400
           isErrorFormat (simpleBody p) `shouldBe` True
+      it "treats plpgsql assert as internal server error" $ do
+        p <- post "/rpc/assert" "{}"
+        liftIO $ do
+          simpleStatus p `shouldBe` internalServerError500
+          isErrorFormat (simpleBody p) `shouldBe` True
 
     context "unsupported verbs" $ do
       it "DELETE fails" $
diff --git a/test/fixtures/schema.sql b/test/fixtures/schema.sql
index 8fc4c0e36..0c0c00273 100644
--- a/test/fixtures/schema.sql
+++ b/test/fixtures/schema.sql
@@ -365,6 +365,15 @@ END;
 $$;
 
 
+CREATE FUNCTION assert() RETURNS void
+    LANGUAGE plpgsql
+    AS $$
+BEGIN
+      ASSERT false, 'bad thing';
+END;
+$$;
+
+
 --
 -- Name: problem(); Type: FUNCTION; Schema: test; Owner: -
 --