diff --git a/src/app/qgscustomprojectiondialog.cpp b/src/app/qgscustomprojectiondialog.cpp
index c91fb5bf5375..bee75a7843d0 100644
--- a/src/app/qgscustomprojectiondialog.cpp
+++ b/src/app/qgscustomprojectiondialog.cpp
@@ -27,6 +27,7 @@
 //qt includes
 #include <QFileInfo>
 #include <QMessageBox>
+#include <QLocale>
 
 //stdc++ includes
 #include <cassert>