diff --git a/left/Makefile b/left/Makefile
index 7941a9c..1255771 100644
--- a/left/Makefile
+++ b/left/Makefile
@@ -31,6 +31,9 @@ FPU = -mfloat-abi=soft
 # Command for flashing the left half of the keyboard.
 FLASH_CMD = node ../lib/agent/packages/usb/update-module-firmware.js leftHalf $(PROJECT_OBJ:.axf=.bin)
 
+# Path to the JLink script used for the left half.
+JLINK_SCRIPT = ../scripts/flash-left.jlink
+
 # Source files.
 SOURCE = $(wildcard src/*.c) \
          ../lib/KSDK_2.0_MKL03Z8xxx4/devices/MKL03Z4/system_MKL03Z4.c \
diff --git a/right/Makefile b/right/Makefile
index ab882d3..0ae5f00 100644
--- a/right/Makefile
+++ b/right/Makefile
@@ -31,6 +31,9 @@ FPU = -mfpu=fpv4-sp-d16 -mfloat-abi=hard
 # Command for flashing the right half of the keyboard.
 FLASH_CMD = node ../lib/agent/packages/usb/update-device-firmware.js $(PROJECT_OBJ:.axf=.hex)
 
+# Path to the JLink script used for the right half.
+JLINK_SCRIPT = ../scripts/flash-right.jlink
+
 # Preprocessor directives.
 BUILD_FLAGS = -DCPU_$(PART)_cm4 -DUSB_STACK_BM -DBL_HAS_BOOTLOADER_CONFIG=1
 
diff --git a/scripts/Makedefs.mk b/scripts/Makedefs.mk
index a0f6fc1..c344580 100644
--- a/scripts/Makedefs.mk
+++ b/scripts/Makedefs.mk
@@ -29,10 +29,24 @@ PROJECT_OBJ = $(BUILD_DIR)/$(PROJECT_NAME).axf
 # Set the prefix for the tools to use.
 PREFIX ?= arm-none-eabi
 
+# Set WIN=1 manually for Windows Subsystem for Linux.
+WIN ?= 0
+
 # Determine if we are on a Windows machine and set the .exe suffix.
-# We can not use the suffix command, as the PREFIX might contain spaces.
 UNAME_S := $(shell uname -s)
 ifeq ($(OS),Windows_NT) # Native Windows.
+    WIN = 1
+endif
+
+# Set J-Link executable.
+ifeq ($(WIN),1)
+    JLINK := JLink.exe
+else
+    JLINK := JLinkExe
+endif
+
+# We can not use the suffix command, as the PREFIX might contain spaces.
+ifeq ($(WIN),1)
     SUFFIX := .exe
 endif
 
@@ -148,7 +162,7 @@ ifeq ($(INTERACTIVE),1)
     color_purple = \033[38;5;097m
 endif
 
-.PHONY: all clean flash
+.PHONY: all clean flash flash-jlink
 
 # The default rule, which causes the project to be built.
 all: $(PROJECT_OBJ)
@@ -161,6 +175,9 @@ clean:
 flash: all
 	@$(FLASH_CMD) || exit 1
 
+flash-jlink: all
+	$(JLINK) -if SWD -CommandFile $(JLINK_SCRIPT) || exit 1
+
 # Rebuild all objects when the Makefiles change.
 $(OBJS): $(MAKEFILE_LIST)
 
diff --git a/scripts/flash-left.jlink b/scripts/flash-left.jlink
new file mode 100644
index 0000000..a250d9d
--- /dev/null
+++ b/scripts/flash-left.jlink
@@ -0,0 +1,7 @@
+speed 4000
+device MKL03Z32xxx4
+connect
+loadfile build_make/uhk_left.hex
+RSetType 2
+r
+qc
diff --git a/scripts/flash-right.jlink b/scripts/flash-right.jlink
new file mode 100644
index 0000000..54b3810
--- /dev/null
+++ b/scripts/flash-right.jlink
@@ -0,0 +1,7 @@
+speed 4000
+device MK22FN512xxx12
+connect
+loadfile build_make/uhk_right.hex
+RSetType 2
+r
+qc