diff --git a/src/support/ProgressInterface.h b/src/support/ProgressInterface.h
index 1fdd3b417b..6ef073ce58 100644
--- a/src/support/ProgressInterface.h
+++ b/src/support/ProgressInterface.h
@@ -12,8 +12,6 @@
 #ifndef LYX_SUPPORT_PROGRESSINTERFACE_H
 #define LYX_SUPPORT_PROGRESSINTERFACE_H
 
-#include <string>
-
 class QString;
 
 namespace lyx {