diff --git a/src/gui_gtk_x11.c b/src/gui_gtk_x11.c
index ecd2d88..2549aef 100644
--- a/src/gui_gtk_x11.c
+++ b/src/gui_gtk_x11.c
@@ -1236,11 +1236,10 @@
     }
     else
     {
-	// <C-H> and <C-h> mean the same thing, always use "H"
-	if ((modifiers & MOD_MASK_CTRL) && ASCII_ISALPHA(key))
-	    key = TOUPPER_ASC(key);
+	// Some keys need adjustment when the Ctrl modifier is used.
+	key = may_adjust_key_for_ctrl(modifiers, key);
 
-	// May remove the shift modifier if it's included in the key.
+	// May remove the Shift modifier if it's included in the key.
 	modifiers = may_remove_shift_modifier(modifiers, key);
 
 	len = mb_char2bytes(key, string);
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);
diff --git a/src/misc2.c b/src/misc2.c
index 3781dd8..b69714a 100644
--- a/src/misc2.c
+++ b/src/misc2.c
@@ -2947,6 +2947,32 @@
 
 
 /*
+ * Some keys are used with Ctrl without Shift and are still expected to be
+ * mapped as if Shift was pressed:
+ * CTRL-2 is CTRL-@
+ * CTRL-6 is CTRL-^
+ * CTRL-- is CTRL-_
+ * Also, <C-H> and <C-h> mean the same thing, always use "H".
+ * Returns the possibly adjusted key.
+ */
+    int
+may_adjust_key_for_ctrl(int modifiers, int key)
+{
+    if (modifiers & MOD_MASK_CTRL)
+    {
+	if (ASCII_ISALPHA(key))
+	    return TOUPPER_ASC(key);
+	if (key == '2')
+	    return '@';
+	if (key == '6')
+	    return '^';
+	if (key == '-')
+	    return '_';
+    }
+    return key;
+}
+
+/*
  * Some keys already have Shift included, pass them as normal keys.
  * Not when Ctrl is also used, because <C-H> and <C-S-H> are different.
  * Also for <A-S-a> and <M-S-a>.
diff --git a/src/proto/misc2.pro b/src/proto/misc2.pro
index d55fc31..fc57403 100644
--- a/src/proto/misc2.pro
+++ b/src/proto/misc2.pro
@@ -72,6 +72,7 @@
 int trans_special(char_u **srcp, char_u *dst, int flags, int *did_simplify);
 int special_to_buf(int key, int modifiers, int keycode, char_u *dst);
 int find_special_key(char_u **srcp, int *modp, int flags, int *did_simplify);
+int may_adjust_key_for_ctrl(int modifiers, int key);
 int may_remove_shift_modifier(int modifiers, int key);
 int extract_modifiers(int key, int *modp, int simplify, int *did_simplify);
 int find_special_key_in_table(int c);
diff --git a/src/term.c b/src/term.c
index 4d32c04..be6d531 100644
--- a/src/term.c
+++ b/src/term.c
@@ -4784,15 +4784,12 @@
 
     modifiers = decode_modifiers(arg[1]);
 
+    // Some keys need adjustment when the Ctrl modifier is used.
+    key = may_adjust_key_for_ctrl(modifiers, key);
+
     // May remove the shift modifier if it's already included in the key.
     modifiers = may_remove_shift_modifier(modifiers, key);
 
-    // When used with Ctrl we always make a letter upper case,
-    // so that mapping <C-H> and <C-h> are the same.  Typing
-    // <C-S-H> also uses "H" but modifier is different.
-    if ((modifiers & MOD_MASK_CTRL) && ASCII_ISALPHA(key))
-	key = TOUPPER_ASC(key);
-
     // insert modifiers with KS_MODIFIER
     new_slen = modifiers2keycode(modifiers, &key, string);
 
diff --git a/src/testdir/test_termcodes.vim b/src/testdir/test_termcodes.vim
index 91ccda8..7d7e2f0 100644
--- a/src/testdir/test_termcodes.vim
+++ b/src/testdir/test_termcodes.vim
@@ -2103,6 +2103,24 @@
 func Test_mapping_works_with_ctrl()
   call RunTest_mapping_works_with_mods(function('GetEscCodeCSI27'), 'C', 5)
   call RunTest_mapping_works_with_mods(function('GetEscCodeCSIu'), 'C', 5)
+
+  new
+  set timeoutlen=10
+
+  " CTRL-@ actually produces the code for CTRL-2, which is converted
+  call RunTest_mapping_mods('<C-@>', '2', function('GetEscCodeCSI27'), 5)
+  call RunTest_mapping_mods('<C-@>', '2', function('GetEscCodeCSIu'), 5)
+
+  " CTRL-^ actually produces the code for CTRL-6, which is converted
+  call RunTest_mapping_mods('<C-^>', '6', function('GetEscCodeCSI27'), 5)
+  call RunTest_mapping_mods('<C-^>', '6', function('GetEscCodeCSIu'), 5)
+
+  " CTRL-_ actually produces the code for CTRL--, which is converted
+  call RunTest_mapping_mods('<C-_>', '-', function('GetEscCodeCSI27'), 5)
+  call RunTest_mapping_mods('<C-_>', '-', function('GetEscCodeCSIu'), 5)
+
+  bwipe!
+  set timeoutlen&
 endfunc
 
 func Test_mapping_works_with_shift_ctrl()
diff --git a/src/version.c b/src/version.c
index 6786727..9c4029f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1809,
+/**/
     1808,
 /**/
     1807,