diff --git a/keyboards/crkbd/keymaps/christoph-cullmann/keymap.c b/keyboards/crkbd/keymaps/christoph-cullmann/keymap.c
index 9f0a147..0a6cea3 100644
--- a/keyboards/crkbd/keymaps/christoph-cullmann/keymap.c
+++ b/keyboards/crkbd/keymaps/christoph-cullmann/keymap.c
@@ -5,7 +5,7 @@
 
 #include QMK_KEYBOARD_H
 
-char chordal_hold_handedness(keypos_t key
+char chordal_hold_handedness(keypos_t key)
 {
     return (key.row < MATRIX_ROWS / 2) ? 'L' : 'R';
 }
diff --git a/keyboards/ferris/keymaps/christoph-cullmann/keymap.c b/keyboards/ferris/keymaps/christoph-cullmann/keymap.c
index 1db3c1a..85c7ef4 100644
--- a/keyboards/ferris/keymaps/christoph-cullmann/keymap.c
+++ b/keyboards/ferris/keymaps/christoph-cullmann/keymap.c
@@ -5,7 +5,7 @@
 
 #include QMK_KEYBOARD_H
 
-char chordal_hold_handedness(keypos_t key
+char chordal_hold_handedness(keypos_t key)
 {
     return (key.row < MATRIX_ROWS / 2) ? 'L' : 'R';
 }
diff --git a/keyboards/planck/keymaps/christoph-cullmann/keymap.c b/keyboards/planck/keymaps/christoph-cullmann/keymap.c
index 10129e6..c44517f 100644
--- a/keyboards/planck/keymaps/christoph-cullmann/keymap.c
+++ b/keyboards/planck/keymaps/christoph-cullmann/keymap.c
@@ -5,7 +5,7 @@
 
 #include QMK_KEYBOARD_H
 
-char chordal_hold_handedness(keypos_t key
+char chordal_hold_handedness(keypos_t key)
 {
     return ((key.row < 3) || (key.row == 3 && key.col < 3) || (key.row == 7 && key.col > 2)) ? 'L' : 'R';
 }