diff --git a/src/main/java/net/bootsfaces/component/datepicker/Datepicker.java b/src/main/java/net/bootsfaces/component/datepicker/Datepicker.java
index a29c59514..18385f58d 100644
--- a/src/main/java/net/bootsfaces/component/datepicker/Datepicker.java
+++ b/src/main/java/net/bootsfaces/component/datepicker/Datepicker.java
@@ -271,7 +271,7 @@ private void encodeHTML(FacesContext fc) throws IOException {
 
 		String formGroupClass = "";
 		if (!(getParent() instanceof FormGroup)) {
-			formGroupClass = "form-group";
+			formGroupClass = "form-group ";
 		}
 		rw.writeAttribute("class", formGroupClass + errorSeverityClass, "class");
 		if (!idHasBeenRendered) {