diff --git a/internal/utilities/utilities.go b/internal/utilities/utilities.go
index 5e71636..5d3766e 100644
--- a/internal/utilities/utilities.go
+++ b/internal/utilities/utilities.go
@@ -5,7 +5,6 @@
 package utilities
 
 import (
-	"errors"
 	"fmt"
 	"os/exec"
 	"regexp"
@@ -17,9 +16,15 @@ func GetFQDN(url string) string {
 	return r.ReplaceAllString(url, "")
 }
 
+type UnspecifiedProgramError struct{}
+
+func (e UnspecifiedProgramError) Error() string {
+	return "the program to view these files is unspecified"
+}
+
 func OpenMedia(viewer string, paths []string) error {
 	if viewer == "" {
-		return errors.New("the image viewer is not specified")
+		return UnspecifiedProgramError{}
 	}
 
 	command := exec.Command(viewer, paths...)