diff --git a/arduino-base.mk b/arduino-base.mk
index a099c7e..387c6cc 100644
--- a/arduino-base.mk
+++ b/arduino-base.mk
@@ -233,12 +233,27 @@ DIRLIB = $(DIRAVR)/avr/lib
 # Define programs and commands.
 SHELL = sh
 
+ifdef WINDOWS
+
+CC = avr-gcc.exe
+
+OBJCOPY = avr-objcopy.exe
+OBJDUMP = avr-objdump.exe
+SIZE = avr-size.exe
+
+AVR_NM = avr-nm.exe
+
+else 
+
 CC = avr-gcc
 
 OBJCOPY = avr-objcopy
 OBJDUMP = avr-objdump
 SIZE = avr-size
 
+AVR_NM = avr-nm
+
+endif
 
 # Programming support using avrdude.
 AVRDUDE = avrdude
@@ -376,7 +391,7 @@ program: $(TARGET).hex $(TARGET).eep
 %.sym: %.elf
 	@echo
 	@echo $(MSG_SYMBOL_TABLE) $@
-	avr-nm -n $< > $@
+	$(AVR_NM) -n $< > $@
 
 
 # Archive Arduino core library