diff --git a/common/keymap.h b/common/keymap.h
index ef712af..cb254df 100644
--- a/common/keymap.h
+++ b/common/keymap.h
@@ -89,13 +89,6 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
 
 };
 
-char chordal_hold_handedness(keypos_t key)
-{
-    // special handle thumb keys
-    if (key.row == 3 || key.row == 7) return '*';
-    return (key.row < MATRIX_ROWS / 2) ? 'L' : 'R';
-}
-
 #ifndef CC_NO_LED
 
 void keyboard_post_init_user(void) {
diff --git a/keyboards/crkbd/keymaps/christoph-cullmann/keymap.c b/keyboards/crkbd/keymaps/christoph-cullmann/keymap.c
index 8e7bc7a..b29ce28 100644
--- a/keyboards/crkbd/keymaps/christoph-cullmann/keymap.c
+++ b/keyboards/crkbd/keymaps/christoph-cullmann/keymap.c
@@ -20,5 +20,11 @@ KC_NO, K20,   K21,   K22,   K23,   K24,          K25,   K26,   K27,   K28,   K29
                      KC_NO, K30,   K31,          K32,   K33,   KC_NO\
 )
 
+// define handness manually, just to be sure
+char chordal_hold_handedness(keypos_t key)
+{
+    return (key.row < MATRIX_ROWS / 2) ? 'L' : 'R';
+}
+
 // our shared 42 keys keymap
 #include "common/keymap.h"
diff --git a/keyboards/ferris/keymaps/christoph-cullmann/keymap.c b/keyboards/ferris/keymaps/christoph-cullmann/keymap.c
index de8f960..c3c1c99 100644
--- a/keyboards/ferris/keymaps/christoph-cullmann/keymap.c
+++ b/keyboards/ferris/keymaps/christoph-cullmann/keymap.c
@@ -23,5 +23,11 @@ K20,   K21,   K22,   K23,   K24,                 K25,   K26,   K27,   K28,   K29
 // no led
 #define CC_NO_LED
 
+// define handness manually, just to be sure
+char chordal_hold_handedness(keypos_t key)
+{
+    return (key.row < MATRIX_ROWS / 2) ? 'L' : 'R';
+}
+
 // our shared 42 keys keymap
 #include "common/keymap.h"
diff --git a/keyboards/planck/keymaps/christoph-cullmann/keymap.c b/keyboards/planck/keymaps/christoph-cullmann/keymap.c
index c91026a..4537f89 100644
--- a/keyboards/planck/keymaps/christoph-cullmann/keymap.c
+++ b/keyboards/planck/keymaps/christoph-cullmann/keymap.c
@@ -20,5 +20,11 @@ K20,   K21,   K22,   K23,   K24,   KC_NO, KC_NO, K25,   K26,   K27,   K28,   K29
 KC_NO, KC_NO, KC_NO, K30,   K31,   KC_NO, KC_NO, K32,   K33,   KC_NO, KC_NO, KC_NO\
 )
 
+// define handness manually, just to be sure
+char chordal_hold_handedness(keypos_t key)
+{
+    return ((pos.row < 3) || (pos.row == 3 && pos.col < 3) || (pos.row == 7 && pos.col > 2)) ? 'L' : 'R';
+}
+
 // our shared 42 keys keymap
 #include "common/keymap.h"
diff --git a/keyboards/splitkb/aurora/sweep/keymaps/christoph-cullmann/keymap.c b/keyboards/splitkb/aurora/sweep/keymaps/christoph-cullmann/keymap.c
index de8f960..c3c1c99 100644
--- a/keyboards/splitkb/aurora/sweep/keymaps/christoph-cullmann/keymap.c
+++ b/keyboards/splitkb/aurora/sweep/keymaps/christoph-cullmann/keymap.c
@@ -23,5 +23,11 @@ K20,   K21,   K22,   K23,   K24,                 K25,   K26,   K27,   K28,   K29
 // no led
 #define CC_NO_LED
 
+// define handness manually, just to be sure
+char chordal_hold_handedness(keypos_t key)
+{
+    return (key.row < MATRIX_ROWS / 2) ? 'L' : 'R';
+}
+
 // our shared 42 keys keymap
 #include "common/keymap.h"