diff --git a/tools/cooja/config/external_tools_win32.config b/tools/cooja/config/external_tools_win32.config
index 06f69eee0..edd06ada0 100644
--- a/tools/cooja/config/external_tools_win32.config
+++ b/tools/cooja/config/external_tools_win32.config
@@ -16,7 +16,7 @@ CMD_GREP_SENSORS = grep '^SENSORS_SENSOR([^,]*,' -o -d skip -D skip -H -r
 REGEXP_PARSE_SENSORS = ([^/]*.c):SENSORS_SENSOR\\(([^,]*),
 LINKER_ARGS_1 = --add-stdcall-alias /usr/lib/mingw/dllcrt2.o
 LINKER_ARGS_2 = -L/usr/lib/mingw -lmingw32 -lmingwex -lmsvcrt
-COMPILER_ARGS = -mno-cygwin -I'C:/Program Files/Java/jdk1.5.0_06/include' -I'C:/Program Files/Java/jdk1.5.0_06/include/win32'
+COMPILER_ARGS = -mno-cygwin -I'$(JAVA_HOME)/include' -I'$(JAVA_HOME)/include/win32'
 CONTIKI_STANDARD_PROCESSES = sensors_process;etimer_process
 CONTIKI_MAIN_TEMPLATE_FILENAME = contiki_template.c
 MANTIS_MAIN_TEMPLATE_FILENAME = mantis_template.c