diff --git a/build_json.mk b/build_json.mk
index 087944cc418..6e2f9c4c8f2 100644
--- a/build_json.mk
+++ b/build_json.mk
@@ -21,6 +21,11 @@ else ifneq ("$(wildcard $(MAIN_KEYMAP_PATH_1)/keymap.json)","")
     KEYMAP_PATH := $(MAIN_KEYMAP_PATH_1)
 endif
 
+# Load the keymap-level rules.mk if exists
+ifneq ("$(wildcard $(KEYMAP_PATH))", "")
+    -include $(KEYMAP_PATH)/rules.mk
+endif
+
 # Generate the keymap.c
 $(KEYBOARD_OUTPUT)/src/keymap.c: $(KEYMAP_JSON)
 	bin/qmk json2c --quiet --output $(KEYMAP_C) $(KEYMAP_JSON)