diff --git a/src/plugins/platforminputcontexts/compose/generator/qtablegenerator.cpp b/src/plugins/platforminputcontexts/compose/generator/qtablegenerator.cpp
index c222b62a36d..4cfc2a6cc44 100644
--- a/src/plugins/platforminputcontexts/compose/generator/qtablegenerator.cpp
+++ b/src/plugins/platforminputcontexts/compose/generator/qtablegenerator.cpp
@@ -57,6 +57,7 @@
 
 #include <string.h> // strchr, strncmp, etc.
 #include <strings.h> // strncasecmp
+#include <clocale> // LC_CTYPE
 
 TableGenerator::TableGenerator() : m_state(NoErrors),
     m_systemComposeDir(QString())
diff --git a/src/plugins/platforms/xcb/qxcbsessionmanager.cpp b/src/plugins/platforms/xcb/qxcbsessionmanager.cpp
index 6abe24b7abb..a3d6a656950 100644
--- a/src/plugins/platforms/xcb/qxcbsessionmanager.cpp
+++ b/src/plugins/platforms/xcb/qxcbsessionmanager.cpp
@@ -49,6 +49,7 @@
 #include <qsocketnotifier.h>
 #include <X11/SM/SMlib.h>
 
+#include <cerrno> // ERANGE
 
 class QSmSocketReceiver : public QObject
 {