diff --git a/src/gui_x11.c b/src/gui_x11.c
index 1eec793..a64bc3b 100644
--- a/src/gui_x11.c
+++ b/src/gui_x11.c
@@ -920,7 +920,12 @@
     if (ev_press->state & ShiftMask)
 	modifiers |= MOD_MASK_SHIFT;
     if (ev_press->state & ControlMask)
+    {
 	modifiers |= MOD_MASK_CTRL;
+	if (len == 1 && string[0] < 0x20)
+	    // Use the character before applyng CTRL.
+	    string[0] += 0x40;
+    }
     if (ev_press->state & Mod1Mask)
 	modifiers |= MOD_MASK_ALT;
     if (ev_press->state & Mod4Mask)