1 files changed, 3 insertions, 0 deletions

diff --git a/common_features.mk b/common_features.mk
index 1c0b3546a..9b99edd75 100644
--- a/common_features.mk
+++ b/common_features.mk
@@ -132,6 +132,9 @@ endif
 ifeq ($(strip $(AUTO_SHIFT_ENABLE)), yes)
     OPT_DEFS += -DAUTO_SHIFT_ENABLE
     SRC += $(QUANTUM_DIR)/process_keycode/process_auto_shift.c
+    ifeq ($(strip $(AUTO_SHIFT_MODIFIERS)), yes)
+        OPT_DEFS += -DAUTO_SHIFT_MODIFIERS
+    endif
 endif
 
 ifeq ($(strip $(SERIAL_LINK_ENABLE)), yes)