diff --git a/cid_test.go b/cid_test.go
index 0dfc56d4..924e4cf3 100644
--- a/cid_test.go
+++ b/cid_test.go
@@ -20,9 +20,6 @@ func TestCIDTranscode(t *testing.T) {
 
 	testutil.TestPgxSuccessfulTranscodeEqFunc(t, pgTypeName, values, eqFunc)
 
-	// No direct conversion from int to cid, convert through text
-	testutil.TestPgxSimpleProtocolSuccessfulTranscodeEqFunc(t, "text::"+pgTypeName, values, eqFunc)
-
 	for _, driverName := range []string{"github.com/lib/pq", "github.com/jackc/pgx/stdlib"} {
 		testutil.TestDatabaseSQLSuccessfulTranscodeEqFunc(t, driverName, pgTypeName, values, eqFunc)
 	}
diff --git a/testutil/testutil.go b/testutil/testutil.go
index 6ea3a69e..462549a7 100644
--- a/testutil/testutil.go
+++ b/testutil/testutil.go
@@ -98,7 +98,6 @@ func TestSuccessfulTranscode(t testing.TB, pgTypeName string, values []interface
 
 func TestSuccessfulTranscodeEqFunc(t testing.TB, pgTypeName string, values []interface{}, eqFunc func(a, b interface{}) bool) {
 	TestPgxSuccessfulTranscodeEqFunc(t, pgTypeName, values, eqFunc)
-	TestPgxSimpleProtocolSuccessfulTranscodeEqFunc(t, pgTypeName, values, eqFunc)
 	for _, driverName := range []string{"github.com/lib/pq", "github.com/jackc/pgx/stdlib"} {
 		TestDatabaseSQLSuccessfulTranscodeEqFunc(t, driverName, pgTypeName, values, eqFunc)
 	}
@@ -150,35 +149,6 @@ func TestPgxSuccessfulTranscodeEqFunc(t testing.TB, pgTypeName string, values []
 	}
 }
 
-func TestPgxSimpleProtocolSuccessfulTranscodeEqFunc(t testing.TB, pgTypeName string, values []interface{}, eqFunc func(a, b interface{}) bool) {
-	conn := MustConnectPgx(t)
-	defer MustCloseContext(t, conn)
-
-	for i, v := range values {
-		// Derefence value if it is a pointer
-		derefV := v
-		refVal := reflect.ValueOf(v)
-		if refVal.Kind() == reflect.Ptr {
-			derefV = refVal.Elem().Interface()
-		}
-
-		result := reflect.New(reflect.TypeOf(derefV))
-		err := conn.QueryRow(
-			context.Background(),
-			fmt.Sprintf("select ($1)::%s", pgTypeName),
-			&pgx.QueryExOptions{SimpleProtocol: true},
-			v,
-		).Scan(result.Interface())
-		if err != nil {
-			t.Errorf("Simple protocol %d: %v", i, err)
-		}
-
-		if !eqFunc(result.Elem().Interface(), derefV) {
-			t.Errorf("Simple protocol %d: expected %v, got %v", i, derefV, result.Elem().Interface())
-		}
-	}
-}
-
 func TestDatabaseSQLSuccessfulTranscodeEqFunc(t testing.TB, driverName, pgTypeName string, values []interface{}, eqFunc func(a, b interface{}) bool) {
 	conn := MustConnectDatabaseSQL(t, driverName)
 	defer MustClose(t, conn)
diff --git a/xid_test.go b/xid_test.go
index d0f3f0ab..594d1214 100644
--- a/xid_test.go
+++ b/xid_test.go
@@ -20,9 +20,6 @@ func TestXIDTranscode(t *testing.T) {
 
 	testutil.TestPgxSuccessfulTranscodeEqFunc(t, pgTypeName, values, eqFunc)
 
-	// No direct conversion from int to xid, convert through text
-	testutil.TestPgxSimpleProtocolSuccessfulTranscodeEqFunc(t, "text::"+pgTypeName, values, eqFunc)
-
 	for _, driverName := range []string{"github.com/lib/pq", "github.com/jackc/pgx/stdlib"} {
 		testutil.TestDatabaseSQLSuccessfulTranscodeEqFunc(t, driverName, pgTypeName, values, eqFunc)
 	}