diff --git a/features/autocorrection.h b/features/autocorrection.h
index e965756..efa2ee9 100644
--- a/features/autocorrection.h
+++ b/features/autocorrection.h
@@ -26,5 +26,13 @@
 
 #include "quantum.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 bool process_autocorrection(uint16_t keycode, keyrecord_t* record);
 
+#ifdef __cplusplus
+}
+#endif
+
diff --git a/features/caps_word.h b/features/caps_word.h
index c900b5d..adec54f 100644
--- a/features/caps_word.h
+++ b/features/caps_word.h
@@ -46,6 +46,10 @@
 
 #include "quantum.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 // Call this function from `process_record_user()` to implement Caps Word.
 bool process_caps_word(uint16_t keycode, keyrecord_t* record);
 
@@ -126,3 +130,7 @@ void caps_word_set_user(bool active);
 // deactivate Caps Word.
 bool caps_word_press_user(uint16_t keycode);
 
+#ifdef __cplusplus
+}
+#endif
+
diff --git a/features/custom_shift_keys.h b/features/custom_shift_keys.h
index 42a228a..3b9aeda 100644
--- a/features/custom_shift_keys.h
+++ b/features/custom_shift_keys.h
@@ -54,6 +54,10 @@
 
 #include "quantum.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef struct {
   uint16_t keycode;
   uint16_t shifted_keycode;
@@ -64,3 +68,7 @@ extern uint8_t NUM_CUSTOM_SHIFT_KEYS;
 
 bool process_custom_shift_keys(uint16_t keycode, keyrecord_t *record);
 
+#ifdef __cplusplus
+}
+#endif
+
diff --git a/features/layer_lock.h b/features/layer_lock.h
index a204950..ee57e42 100644
--- a/features/layer_lock.h
+++ b/features/layer_lock.h
@@ -42,6 +42,10 @@
 
 #include "quantum.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 // In your keymap, define a custom keycode to use for Layer Lock. Then handle
 // Layer Lock from your `process_record_user` function by calling
 // `process_layer_lock`, passing your custom keycode for the `lock_keycode` arg:
@@ -78,3 +82,7 @@ void layer_lock_invert(uint8_t layer);
 //   }
 void layer_lock_set_user(layer_state_t locked_layers);
 
+#ifdef __cplusplus
+}
+#endif
+
diff --git a/features/mouse_turbo_click.h b/features/mouse_turbo_click.h
index 9345c8d..c81bfa8 100644
--- a/features/mouse_turbo_click.h
+++ b/features/mouse_turbo_click.h
@@ -35,6 +35,10 @@
 
 #include "quantum.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 // In your keymap, define a custom keycode to use for Turbo Click. Then handle
 // Turbo Click from your `process_record_user` function by calling
 // `process_mouse_turbo_click`, passing your custom keycode for the
@@ -51,3 +55,7 @@
 bool process_mouse_turbo_click(uint16_t keycode, keyrecord_t* record,
                                uint16_t turbo_click_keycode);
 
+#ifdef __cplusplus
+}
+#endif
+
diff --git a/features/select_word.h b/features/select_word.h
index 4f504a5..f1229a1 100644
--- a/features/select_word.h
+++ b/features/select_word.h
@@ -33,6 +33,14 @@
 
 #include "quantum.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 bool process_select_word(uint16_t keycode, keyrecord_t* record,
                          uint16_t sel_keycode);
 
+#ifdef __cplusplus
+}
+#endif
+