diff --git a/src/plugins/cmakeprojectmanager/cmakestep.h b/src/plugins/cmakeprojectmanager/cmakestep.h
index fdf93c31a83..fb4b9727c42 100644
--- a/src/plugins/cmakeprojectmanager/cmakestep.h
+++ b/src/plugins/cmakeprojectmanager/cmakestep.h
@@ -37,7 +37,9 @@
 #include <projectexplorer/buildstep.h>
 #include <projectexplorer/abstractprocessstep.h>
 
+QT_BEGIN_NAMESPACE
 class QLineEdit;
+QT_END_NAMESPACE
 
 namespace CMakeProjectManager {
 namespace Internal {
diff --git a/src/plugins/cmakeprojectmanager/makestep.h b/src/plugins/cmakeprojectmanager/makestep.h
index 1b32ab6f2fc..61b27c634a9 100644
--- a/src/plugins/cmakeprojectmanager/makestep.h
+++ b/src/plugins/cmakeprojectmanager/makestep.h
@@ -36,9 +36,11 @@
 
 #include <projectexplorer/abstractprocessstep.h>
 
+QT_BEGIN_NAMESPACE
 class QLineEdit;
 class QListWidget;
 class QListWidgetItem;
+QT_END_NAMESPACE
 
 namespace CMakeProjectManager {
 namespace Internal {