diff --git a/Arduino.mk b/Arduino.mk
index 107bdc3..1d7299f 100644
--- a/Arduino.mk
+++ b/Arduino.mk
@@ -1566,15 +1566,15 @@ show_submenu:
 	@$(CAT) $(BOARDS_TXT) | grep -E '[a-zA-Z0-9_\-]+.menu.(cpu|chip).[a-zA-Z0-9_\-]+=' | sort -uf | sed 's/.menu.\(cpu\|chip\)./:/' | sed 's/=/:/' | column -s: -t
 
 monitor:
-ifeq ($(MONITOR_CMD), 'putty')
+ifeq ($(notdir $(MONITOR_CMD)), putty)
 	ifneq ($(strip $(MONITOR_PARAMS)),)
 	$(MONITOR_CMD) -serial -sercfg $(MONITOR_BAUDRATE),$(MONITOR_PARAMS) $(call get_monitor_port)
 	else
 	$(MONITOR_CMD) -serial -sercfg $(MONITOR_BAUDRATE) $(call get_monitor_port)
 	endif
-else ifeq ($(MONITOR_CMD), picocom)
+else ifeq ($(notdir $(MONITOR_CMD)), picocom)
 		$(MONITOR_CMD) -b $(MONITOR_BAUDRATE) $(MONITOR_PARAMS) $(call get_monitor_port)
-else ifeq ($(MONITOR_CMD), cu)
+else ifeq ($(notdir $(MONITOR_CMD)), cu)
 		$(MONITOR_CMD) -l $(call get_monitor_port) -s $(MONITOR_BAUDRATE)
 else
 		$(MONITOR_CMD) $(call get_monitor_port) $(MONITOR_BAUDRATE)
diff --git a/HISTORY.md b/HISTORY.md
index 6fa2606..34706b3 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -7,6 +7,7 @@ I tried to give credit whenever possible. If I have missed anyone, kindly add it
 ### In Development
 - Fix: Add -fno-devirtualize flag to workaround g++ segfault bug (issue #486). (https://github.com/sej7278)
 - Fix: Quote the prefix tag in the space_pad_to function
+- Fix: recognize serial monitors with full path in MONITOR_CMD
 - Tweak: Set ARDMK_VERSION to 1.6 (https://github.com/sej7278)
 - Tweak: Move non-standard-related items from CxxFLAGS_STD to CxxFLAGS (issue #523) (https://github.com/sej7278)
 - Tweak: Update Windows usage documentation and allow non-relative paths (issue #519) (https://github.com/tuna-f1sh)