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-rw-r--r--mail/em-format-html-display.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/mail/em-format-html-display.c b/mail/em-format-html-display.c
index 7342cc076b..63069d3c87 100644
--- a/mail/em-format-html-display.c
+++ b/mail/em-format-html-display.c
@@ -62,6 +62,7 @@
#include <gtk/gtktoolbutton.h>
#include <gtk/gtkframe.h>
#include <gtk/gtkcheckbutton.h>
+#include <gtk/gtksignal.h>
#include <glade/glade.h>