diff --git a/common_features.mk b/common_features.mk
index 6ed7e73b66..6365955a7f 100644
--- a/common_features.mk
+++ b/common_features.mk
@@ -135,7 +135,7 @@ else
         # This ensures that the EEPROM page buffer fits into RAM
         USE_PROCESS_STACKSIZE = 0x600
         USE_EXCEPTIONS_STACKSIZE = 0x300
-        
+
         SRC += $(PLATFORM_COMMON_DIR)/eeprom_stm32.c
         SRC += $(PLATFORM_COMMON_DIR)/flash_stm32.c
         OPT_DEFS += -DEEPROM_EMU_STM32F042x6
@@ -483,7 +483,7 @@ ifeq ($(strip $(SPLIT_KEYBOARD)), yes)
 
     # Determine which (if any) transport files are required
     ifneq ($(strip $(SPLIT_TRANSPORT)), custom)
-        QUANTUM_SRC += $(QUANTUM_DIR)/split_common/transport.c
+        QUANTUM_LIB_SRC += $(QUANTUM_DIR)/split_common/transport.c
         # Functions added via QUANTUM_LIB_SRC are only included in the final binary if they're called.
         # Unused functions are pruned away, which is why we can add multiple drivers here without bloat.
         ifeq ($(PLATFORM),AVR)
diff --git a/keyboards/handwired/dactyl_manuform/5x6_right_trackball/rules.mk b/keyboards/handwired/dactyl_manuform/5x6_right_trackball/rules.mk
index 19b330cdc5..0eeb0bed04 100644
--- a/keyboards/handwired/dactyl_manuform/5x6_right_trackball/rules.mk
+++ b/keyboards/handwired/dactyl_manuform/5x6_right_trackball/rules.mk
@@ -26,5 +26,5 @@ POINTING_DEVICE_ENABLE = yes
 SPLIT_KEYBOARD = yes
 SPLIT_TRANSPORT = custom
 
-SRC += pointer_transport.c pmw3360.c
-QUANTUM_LIB_SRC += serial.c i2c_master.c i2c_slave.c spi_master.c
+SRC += pmw3360.c
+QUANTUM_LIB_SRC += serial.c i2c_master.c i2c_slave.c spi_master.c pointer_transport.c