diff --git a/src/gui/textbox.cpp b/src/gui/textbox.cpp
index 30b096583..8132556e0 100644
--- a/src/gui/textbox.cpp
+++ b/src/gui/textbox.cpp
@@ -9,6 +9,7 @@
 #include "gui/textbox.h"
 
 #include "gfx/size.h"
+#include "gui/intern.h"
 #include "gui/message.h"
 #include "gui/preferred_size_event.h"
 #include "gui/system.h"
diff --git a/src/gui/theme.cpp b/src/gui/theme.cpp
index 7e07812f7..583a50839 100644
--- a/src/gui/theme.cpp
+++ b/src/gui/theme.cpp
@@ -13,6 +13,7 @@
 #include "gfx/size.h"
 #include "gui/draw.h"
 #include "gui/font.h"
+#include "gui/intern.h"
 #include "gui/manager.h"
 #include "gui/rect.h"
 #include "gui/system.h"