diff --git a/components/esptool_py/Makefile.projbuild b/components/esptool_py/Makefile.projbuild
index 261938ff1a..07dab73f55 100644
--- a/components/esptool_py/Makefile.projbuild
+++ b/components/esptool_py/Makefile.projbuild
@@ -15,7 +15,7 @@ PYTHON ?= $(call dequote,$(CONFIG_SDK_PYTHON))
 #
 ESPTOOLPY_SRC := $(COMPONENT_PATH)/esptool/esptool.py
 ESPTOOLPY := $(PYTHON) $(ESPTOOLPY_SRC) --chip esp32
-ESPTOOLPY_SERIAL := $(ESPTOOLPY) --port $(ESPPORT) --baud $(ESPBAUD) --before $(CONFIG_ESPTOOLPY_BEFORE) --after $(CONFIG_ESPTOOLPY_AFTER)
+ESPTOOLPY_SERIAL := $(ESPTOOLPY) --port '$(ESPPORT)' --baud $(ESPBAUD) --before $(CONFIG_ESPTOOLPY_BEFORE) --after $(CONFIG_ESPTOOLPY_AFTER)
 
 # Supporting esptool command line tools
 ESPEFUSEPY := $(PYTHON) $(COMPONENT_PATH)/esptool/espefuse.py
@@ -89,7 +89,7 @@ endif
 ifdef CONFIG_SECURE_FLASH_ENCRYPTION_MODE_DEVELOPMENT
 encrypted-flash: all_binaries $(ESPTOOLPY_SRC) $(call prereq_if_explicit,erase_flash) partition_table_get_info | check_python_dependencies
 	$(eval MONITOR_OPTS += --encrypted)
-	@echo "Flashing binaries to serial port $(ESPPORT) (app at offset $(APP_OFFSET))..."
+	@echo "Flashing binaries to serial port '$(ESPPORT)' (app at offset $(APP_OFFSET))..."
 ifdef CONFIG_SECURE_BOOT
 	@echo "(Secure boot enabled, so bootloader not flashed automatically. See 'make bootloader' output)"
 endif
@@ -101,20 +101,20 @@ encrypted-flash:
 endif
 
 flash: all_binaries $(ESPTOOLPY_SRC) $(call prereq_if_explicit,erase_flash) partition_table_get_info | check_python_dependencies
-	@echo "Flashing binaries to serial port $(ESPPORT) (app at offset $(APP_OFFSET))..."
+	@echo "Flashing binaries to serial port '$(ESPPORT)' (app at offset $(APP_OFFSET))..."
 ifdef CONFIG_SECURE_BOOT
 	@echo "(Secure boot enabled, so bootloader not flashed automatically. See 'make bootloader' output)"
 endif
 	$(ESPTOOLPY_WRITE_FLASH) $(ESPTOOL_ALL_FLASH_ARGS)
 
 app-flash: $(APP_BIN) $(ESPTOOLPY_SRC) $(call prereq_if_explicit,erase_flash) partition_table_get_info | check_python_dependencies
-	@echo "Flashing app to serial port $(ESPPORT), offset $(APP_OFFSET)..."
+	@echo "Flashing app to serial port '$(ESPPORT)', offset $(APP_OFFSET)..."
 	$(ESPTOOLPY_WRITE_FLASH) $(APP_OFFSET) $(APP_BIN)
 
 ifdef CONFIG_SECURE_FLASH_ENCRYPTION_MODE_DEVELOPMENT
 encrypted-app-flash: $(APP_BIN) $(ESPTOOLPY_SRC) $(call prereq_if_explicit,erase_flash) partition_table_get_info | check_python_dependencies
 	$(eval MONITOR_OPTS += --encrypted)
-	@echo "Flashing encrypted app binary to serial port $(ESPPORT) (app at offset $(APP_OFFSET))..."
+	@echo "Flashing encrypted app binary to serial port '$(ESPPORT)' (app at offset $(APP_OFFSET))..."
 	$(ESPTOOLPY_WRITE_FLASH_ENCRYPT) $(APP_OFFSET) $(APP_BIN)
 else
 encrypted-app-flash:
@@ -144,7 +144,7 @@ endif
 # miniterm.py on the console. The '$(PYTHON) -m serial.tools.miniterm'
 # is to allow for the $(PYTHON) variable overriding the python path.
 simple_monitor: $(call prereq_if_explicit,%flash) | check_python_dependencies
-	$(MONITOR_PYTHON) -m serial.tools.miniterm --rts 0 --dtr 0 --raw $(ESPPORT) $(MONITORBAUD)
+	$(MONITOR_PYTHON) -m serial.tools.miniterm --rts 0 --dtr 0 --raw '$(ESPPORT)' $(MONITORBAUD)
 
 PRINT_FILTER ?=
 
@@ -154,7 +154,7 @@ ifneq ("$(MONITOR_CORE_DUMP_DECODE)","")
 MONITOR_CORE_DUMP_DECODE_ARG = --decode-coredumps $(MONITOR_CORE_DUMP_DECODE)
 endif
 
-MONITOR_OPTS := --baud $(MONITORBAUD) --port $(ESPPORT) --toolchain-prefix $(CONFIG_SDK_TOOLPREFIX) --make "$(MAKE)" --print_filter "$(PRINT_FILTER)" $(MONITOR_CORE_DUMP_DECODE_ARG)
+MONITOR_OPTS := --baud $(MONITORBAUD) --port '$(ESPPORT)' --toolchain-prefix $(CONFIG_SDK_TOOLPREFIX) --make "$(MAKE)" --print_filter "$(PRINT_FILTER)" $(MONITOR_CORE_DUMP_DECODE_ARG)
 
 monitor: $(call prereq_if_explicit,%flash) | check_python_dependencies
 	$(summary) MONITOR
diff --git a/tools/idf_monitor.py b/tools/idf_monitor.py
index ce55327bbd..19c36f1315 100755
--- a/tools/idf_monitor.py
+++ b/tools/idf_monitor.py
@@ -649,7 +649,7 @@ class Monitor(object):
             else:
                 popen_args = [self.make, target]
             yellow_print("Running %s..." % " ".join(popen_args))
-            p = subprocess.Popen(popen_args)
+            p = subprocess.Popen(popen_args, env=os.environ)
             try:
                 p.wait()
             except KeyboardInterrupt:
@@ -967,6 +967,13 @@ def main():
     except KeyError:
         pass  # not running a make jobserver
 
+    # Pass the actual used port to callee of idf_monitor (e.g. make) through `ESPPORT` environment
+    # variable
+    # To make sure the key as well as the value are str type, by the requirements of subprocess
+    espport_key = str("ESPPORT")
+    espport_val = str(args.port)
+    os.environ.update({espport_key: espport_val})
+
     monitor = Monitor(serial_instance, args.elf_file.name, args.print_filter, args.make, args.encrypted,
                       args.toolchain_prefix, args.eol,
                       args.decode_coredumps)