diff --git a/src/qgsprojectpropertiesbase.ui b/src/qgsprojectpropertiesbase.ui
index ec13f9c68ab..6ff1b6259d6 100644
--- a/src/qgsprojectpropertiesbase.ui
+++ b/src/qgsprojectpropertiesbase.ui
@@ -1,4 +1,4 @@
-<!DOCTYPE UI><UI version="3.2" stdsetdef="1">
+<!DOCTYPE UI><UI version="3.1" stdsetdef="1">
 <class>QgsProjectPropertiesBase</class>
 <widget class="QDialog">
     <property name="name">