diff --git a/internal/piwigo/piwigotools/categories.go b/internal/piwigo/piwigotools/categories.go
index 4c0ea34..de50e38 100644
--- a/internal/piwigo/piwigotools/categories.go
+++ b/internal/piwigo/piwigotools/categories.go
@@ -10,9 +10,9 @@ type Category struct {
 }
 
 func (c *Categories) Names() []string {
-	names := []string{}
-	for _, category := range *c {
-		names = append(names, category.Name)
+	names := make([]string, len(*c))
+	for i, category := range *c {
+		names[i] = category.Name
 	}
 	return names
 }
diff --git a/internal/piwigo/piwigotools/tags.go b/internal/piwigo/piwigotools/tags.go
index 59a3017..f3e1f32 100644
--- a/internal/piwigo/piwigotools/tags.go
+++ b/internal/piwigo/piwigotools/tags.go
@@ -17,13 +17,13 @@ type Tag struct {
 }
 
 func (c Tags) NamesWithAgeAt(createdAt TimeResult) []string {
-	names := []string{}
-	for _, category := range c {
+	names := make([]string, len(c))
+	for i, category := range c {
 		bd := category.Birthdate.AgeAt(createdAt)
 		if bd != "" {
-			names = append(names, fmt.Sprintf("%s (%s)", category.Name, bd))
+			names[i] = fmt.Sprintf("%s (%s)", category.Name, bd)
 		} else {
-			names = append(names, category.Name)
+			names[i] = category.Name
 		}
 	}
 	return names