diff --git a/tools/sptool/Makefile b/tools/sptool/Makefile
index f724c26..1fa85fb 100644
--- a/tools/sptool/Makefile
+++ b/tools/sptool/Makefile
@@ -8,6 +8,7 @@
 include ${MAKE_HELPERS_DIRECTORY}build_macros.mk
 include ${MAKE_HELPERS_DIRECTORY}build_env.mk
 
+SPTOOL  ?= sptool${BIN_EXT}
 PROJECT := $(notdir ${SPTOOL})
 OBJECTS := sptool.o
 V ?= 0