diff --git a/libreplan-webapp/src/main/java/org/libreplan/web/common/ConfigurationController.java b/libreplan-webapp/src/main/java/org/libreplan/web/common/ConfigurationController.java
index 323fd2af1..ca8b9feed 100644
--- a/libreplan-webapp/src/main/java/org/libreplan/web/common/ConfigurationController.java
+++ b/libreplan-webapp/src/main/java/org/libreplan/web/common/ConfigurationController.java
@@ -1098,6 +1098,7 @@ public class ConfigurationController extends GenericForwardComposer {
             private void appendValueTextbox(Row row,
                     final AppProperties appProperties) {
                 final Textbox textbox = new Textbox();
+                textbox.setWidth("400px");
                 textbox.setConstraint(checkPropertyValue((AppProperties) row
                         .getValue()));