diff --git a/README.md b/README.md
index 04fc9b0..8dd093b 100644
--- a/README.md
+++ b/README.md
@@ -31,6 +31,7 @@ Flags:
   -min          	   minimum value, only works with -numbers
   -max          	   maximum value, only works with -numbers
   -output            output formatting (text or json)
+  -set-exit-status   Set exit status to 2 if any issues are found
 
 Examples:
 
diff --git a/cmd/goconst/main.go b/cmd/goconst/main.go
index a06515d..d55e38b 100644
--- a/cmd/goconst/main.go
+++ b/cmd/goconst/main.go
@@ -30,6 +30,7 @@ Flags:
   -min               minimum value, only works with -numbers
   -max               maximum value, only works with -numbers
   -output            output formatting (text or json)
+  -set-exit-status   Set exit status to 2 if any issues are found
 
 Examples:
 
@@ -49,6 +50,7 @@ var (
 	flagMin            = flag.Int("min", 0, "minimum value, only works with -numbers")
 	flagMax            = flag.Int("max", 0, "maximum value, only works with -numbers")
 	flagOutput         = flag.String("output", "text", "output formatting")
+	flagSetExitStatus  = flag.Bool("set-exit-status", false, "Set exit status to 2 if any issues are found")
 )
 
 func main() {
@@ -63,15 +65,26 @@ func main() {
 		usage(os.Stderr)
 		os.Exit(1)
 	}
+
+	lintFailed := false
 	for _, path := range args {
-		if err := run(path); err != nil {
+		anyIssues, err := run(path)
+		if err != nil {
 			log.Println(err)
 			os.Exit(1)
 		}
+
+		if anyIssues {
+			lintFailed = true
+		}
+	}
+
+	if lintFailed && *flagSetExitStatus {
+		os.Exit(2)
 	}
 }
 
-func run(path string) error {
+func run(path string) (bool, error) {
 	gco := goconst.New(
 		path,
 		*flagIgnore,
@@ -82,7 +95,7 @@ func run(path string) error {
 	)
 	strs, consts, err := gco.ParseTree()
 	if err != nil {
-		return err
+		return false, err
 	}
 
 	return printOutput(strs, consts, *flagOutput, *flagMinOccurrences, *flagMin, *flagMax)
@@ -92,7 +105,7 @@ func usage(out io.Writer) {
 	fmt.Fprintf(out, usageDoc)
 }
 
-func printOutput(strs goconst.Strings, consts goconst.Constants, output string, minOccurrences, min, max int) error {
+func printOutput(strs goconst.Strings, consts goconst.Constants, output string, minOccurrences, min, max int) (bool, error) {
 	for str, item := range strs {
 		// Filter out items whose occurrences don't match the min value
 		if len(item) < minOccurrences {
@@ -120,7 +133,7 @@ func printOutput(strs goconst.Strings, consts goconst.Constants, output string,
 			strs, consts,
 		})
 		if err != nil {
-			return err
+			return false, err
 		}
 	case "text":
 		for str, item := range strs {
@@ -147,9 +160,9 @@ func printOutput(strs goconst.Strings, consts goconst.Constants, output string,
 			}
 		}
 	default:
-		return fmt.Errorf(`Unsupported output format: %s`, output)
+		return false, fmt.Errorf(`Unsupported output format: %s`, output)
 	}
-	return nil
+	return len(strs) + len(consts) > 0, nil
 }
 
 func occurrences(item []goconst.ExtendedPos, current goconst.ExtendedPos) string {
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..53dbfbb
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module github.com/jgautheron/goconst
+
+go 1.13
diff --git a/tests/foo_test.go b/tests/foo_test.go
new file mode 100644
index 0000000..96395f1
--- /dev/null
+++ b/tests/foo_test.go
@@ -0,0 +1,9 @@
+package main
+
+import "fmt"
+
+func foo() {
+	foo := "test"
+	boo := "test"
+	fmt.Println(foo, boo)
+}
diff --git a/tests/main.go b/tests/main.go
new file mode 100644
index 0000000..227ab61
--- /dev/null
+++ b/tests/main.go
@@ -0,0 +1,30 @@
+package main
+
+import (
+	"fmt"
+	"strings"
+)
+
+const Foo = "bar"
+
+var url string
+
+func main() {
+	if strings.HasPrefix(url, "http://") {
+		url = strings.TrimPrefix(url, "http://")
+	}
+	url = strings.TrimPrefix(url, "/")
+	fmt.Println(url)
+}
+
+func testCase() string {
+	test := `test`
+	if url == "test" {
+		return test
+	}
+	switch url {
+	case "moo":
+		return ""
+	}
+	return "foo"
+}
diff --git a/visitor.go b/visitor.go
index a86421f..27cd5d8 100644
--- a/visitor.go
+++ b/visitor.go
@@ -95,6 +95,15 @@ func (v *treeVisitor) Visit(node ast.Node) ast.Visitor {
 				v.addString(lit.Value, lit.Pos())
 			}
 		}
+
+	// fn("http://")
+	case *ast.CallExpr:
+		for _, item := range t.Args {
+			lit, ok := item.(*ast.BasicLit)
+			if ok && v.isSupported(lit.Kind) {
+				v.addString(lit.Value, lit.Pos())
+			}
+		}
 	}
 
 	return v
@@ -102,7 +111,8 @@ func (v *treeVisitor) Visit(node ast.Node) ast.Visitor {
 
 // addString adds a string in the map along with its position in the tree.
 func (v *treeVisitor) addString(str string, pos token.Pos) {
-	str = strings.Replace(str, `"`, "", 2)
+	// Drop first and last character, quote, backquote...
+	str = str[1 : len(str)-1]
 
 	// Ignore empty strings
 	if len(str) == 0 {