1 files changed, 1 insertions, 1 deletions
diff --git a/server/src/main/java/com/vaadin/ui/declarative/Design.java b/server/src/main/java/com/vaadin/ui/declarative/Design.java
index 78288737a0..761ce3c355 100644
--- a/server/src/main/java/com/vaadin/ui/declarative/Design.java
+++ b/server/src/main/java/com/vaadin/ui/declarative/Design.java
@@ -302,7 +302,7 @@ public class Design implements Serializable {
                 Character c = className.charAt(i);
                 if (Character.isUpperCase(c)) {
                     if (i > 0) {
-                        result.append("-");
+                        result.append('-');
                     }
                     result.append(Character.toLowerCase(c));
                 } else {