diff --git a/src/ant/ant/antPropertiesPage.cc b/src/ant/ant/antPropertiesPage.cc
index 00ec4e61e..61bc261ae 100644
--- a/src/ant/ant/antPropertiesPage.cc
+++ b/src/ant/ant/antPropertiesPage.cc
@@ -27,6 +27,8 @@
 #include "layQtTools.h"
 #include "tlException.h"
 
+#include <QSignalBlocker>
+
 namespace ant
 {