diff --git a/src/app/app.h b/src/app/app.h
index 14f3f6ed5..d0953ff5e 100644
--- a/src/app/app.h
+++ b/src/app/app.h
@@ -11,7 +11,6 @@
 
 #include "app/app_brushes.h"
 #include "base/signal.h"
-#include "base/string.h"
 #include "base/unique_ptr.h"
 #include "doc/pixel_format.h"
 
diff --git a/src/app/app_menus.cpp b/src/app/app_menus.cpp
index e3c9f8b36..8403c9d2d 100644
--- a/src/app/app_menus.cpp
+++ b/src/app/app_menus.cpp
@@ -11,6 +11,7 @@
 
 #include "app/app_menus.h"
 
+#include "base/string.h"
 #include "app/app.h"
 #include "app/commands/command.h"
 #include "app/commands/commands.h"
diff --git a/src/app/commands/cmd_export_sprite_sheet.cpp b/src/app/commands/cmd_export_sprite_sheet.cpp
index b293ee818..b1997053b 100644
--- a/src/app/commands/cmd_export_sprite_sheet.cpp
+++ b/src/app/commands/cmd_export_sprite_sheet.cpp
@@ -9,6 +9,7 @@
 #include "config.h"
 #endif
 
+#include "base/string.h"
 #include "app/app.h"
 #include "app/commands/command.h"
 #include "app/context.h"
diff --git a/src/app/ui/file_selector.cpp b/src/app/ui/file_selector.cpp
index 63e6bdc07..23bf3715b 100644
--- a/src/app/ui/file_selector.cpp
+++ b/src/app/ui/file_selector.cpp
@@ -11,6 +11,7 @@
 
 #include "app/ui/file_selector.h"
 
+#include "base/string.h"
 #include "app/app.h"
 #include "app/console.h"
 #include "app/file/file.h"