diff --git a/lib/postgrex/protocol.ex b/lib/postgrex/protocol.ex
index 28dd2867..78162427 100644
--- a/lib/postgrex/protocol.ex
+++ b/lib/postgrex/protocol.ex
@@ -13,7 +13,8 @@ defmodule Postgrex.Protocol do
   @max_rows 500
   @text_type_oid 25
   @commit_comment_validation_error Postgrex.Error.exception(
-                                     message: "`:commit_comment` option cannot contain sequence \"*/\""
+                                     message:
+                                       "`:commit_comment` option cannot contain sequence \"*/\""
                                    )
 
   defstruct sock: nil,
diff --git a/test/query_test.exs b/test/query_test.exs
index 98ad9dcd..312d2f38 100644
--- a/test/query_test.exs
+++ b/test/query_test.exs
@@ -17,7 +17,7 @@ defmodule QueryTest do
   end
 
   test "iodata", context do
-    assert [[123]] = query(["S", ?E, ["LEC" | "T"], " ", '123'], [])
+    assert [[123]] = query(["S", ?E, ["LEC" | "T"], " ", ~c"123"], [])
   end
 
   test "decode basic types", context do
diff --git a/test/transaction_test.exs b/test/transaction_test.exs
index 54b0a95f..219825bd 100644
--- a/test/transaction_test.exs
+++ b/test/transaction_test.exs
@@ -553,7 +553,9 @@ defmodule TransactionTest do
     assert transaction(
              fn conn ->
                assert {:error, %Postgrex.Error{postgres: %{code: :unique_violation}}} =
-                        P.query(conn, "insert into uniques values (1), (1);", [], mode: :savepoint)
+                        P.query(conn, "insert into uniques values (1), (1);", [],
+                          mode: :savepoint
+                        )
 
                assert {:ok, %Postgrex.Result{rows: [[42]]}} = P.query(conn, "SELECT 42", [])
                :hi
@@ -593,7 +595,9 @@ defmodule TransactionTest do
     assert transaction(
              fn conn ->
                assert {:error, %Postgrex.Error{postgres: %{code: :unique_violation}}} =
-                        P.query(conn, "insert into uniques values (1), (1);", [], mode: :savepoint)
+                        P.query(conn, "insert into uniques values (1), (1);", [],
+                          mode: :savepoint
+                        )
 
                assert {:ok, %Postgrex.Result{rows: [[42]]}} = P.query(conn, "SELECT 42", [])
                :hi