diff --git a/avr/platform.txt b/avr/platform.txt
index 181095133..2f217b47f 100644
--- a/avr/platform.txt
+++ b/avr/platform.txt
@@ -86,7 +86,7 @@ preproc.includes.flags=-w -x c++ -M -MG -MP
 recipe.preproc.includes="{compiler.path}{compiler.cpp.cmd}" {compiler.cpp.flags} {preproc.includes.flags} -mmcu={build.mcu} -DF_CPU={build.f_cpu} -DARDUINO={runtime.ide.version} -DARDUINO_{build.board} -DARDUINO_ARCH_{build.arch} {compiler.cpp.extra_flags} {build.extra_flags} {includes} "{source_file}"
 
 # The following line provides Arduino IDE 1.6.6 compatibility with the Arduino IDE 1.6.7 version of recipe.preproc.macros used here
-preprocessed_file_path=null
+preprocessed_file_path={build.path}/nul
 preproc.macros.flags=-w -x c++ -E -CC
 recipe.preproc.macros="{compiler.path}{compiler.cpp.cmd}" {compiler.cpp.flags} {preproc.macros.flags} -mmcu={build.mcu} -DF_CPU={build.f_cpu} -DARDUINO={runtime.ide.version} -DARDUINO_{build.board} -DARDUINO_ARCH_{build.arch} {compiler.cpp.extra_flags} {build.extra_flags} {includes} "{source_file}" -o "{preprocessed_file_path}"