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diff --git a/keyboards/lfkeyboards/mini1800/rules.mk b/keyboards/lfkeyboards/mini1800/rules.mk
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+# Set the LFK87 hardware version.
+#
+# RevA - Green PCB. at90usb1286 Only 3 exist
+# RevB - We don't talk about RevB
+# RevC - Black PCB. at90usb646 First public release
+#
+# Set to A or C
+LFK_REV = C
+
+ifeq ($(LFK_REV), A)
+	MCU = at90usb1286
+	OPT_DEFS += -DBOOTLOADER_SIZE=8192
+else
+	MCU = at90usb646
+	OPT_DEFS += -DBOOTLOADER_SIZE=4096
+endif
+OPT_DEFS += -DLFK_TKL_REV_$(LFK_REV)
+
+# Processor frequency.
+#     This will define a symbol, F_CPU, in all source code files equal to the
+#     processor frequency in Hz. You can then use this symbol in your source code to
+#     calculate timings. Do NOT tack on a 'UL' at the end, this will be done
+#     automatically to create a 32-bit value in your source code.
+#
+#     This will be an integer division of F_USB below, as it is sourced by
+#     F_USB after it has run through any CPU prescalers. Note that this value
+#     does not *change* the processor frequency - it should merely be updated to
+#     reflect the processor speed set externally so that the code can use accurate
+#     software delays.
+F_CPU = 16000000
+
+
+#
+# LUFA specific
+#
+# Target architecture (see library "Board Types" documentation).
+ARCH = AVR8
+
+# Input clock frequency.
+#     This will define a symbol, F_USB, in all source code files equal to the
+#     input clock frequency (before any prescaling is performed) in Hz. This value may
+#     differ from F_CPU if prescaling is used on the latter, and is required as the
+#     raw input clock is fed directly to the PLL sections of the AVR for high speed
+#     clock generation for the USB and other AVR subsections. Do NOT tack on a 'UL'
+#     at the end, this will be done automatically to create a 32-bit value in your
+#     source code.
+#
+#     If no clock division is performed on the input clock inside the AVR (via the
+#     CPU clock adjust registers or the clock division fuses), this will be equal to F_CPU.
+F_USB = $(F_CPU)
+
+# Interrupt driven control endpoint task(+60)
+OPT_DEFS += -DINTERRUPT_CONTROL_ENDPOINT
+
+# ifndef QUANTUM_DIR
+# 	include ../../Makefile
+# endif
+
+
+ifeq ($(strip $(ISSI_ENABLE)), yes)
+    # TMK_COMMON_DEFS += -DISSI_ENABLE
+endif