diff --git a/src/gui_x11.c b/src/gui_x11.c
index f1d9bf8..38f85d8 100644
--- a/src/gui_x11.c
+++ b/src/gui_x11.c
@@ -956,6 +956,9 @@
     {
 	len = mb_char2bytes(key, string);
 
+	// Some keys need adjustment when the Ctrl modifier is used.
+	key = may_adjust_key_for_ctrl(modifiers, key);
+
 	// Remove the SHIFT modifier for keys where it's already included,
 	// e.g., '(', '!' and '*'.
 	modifiers = may_remove_shift_modifier(modifiers, key);