diff --git a/build.mk b/build.mk
index 1956406..5aba085 100644
--- a/build.mk
+++ b/build.mk
@@ -50,11 +50,7 @@
 NEWDIRS += $(sort $(dir $(ALLOBJS)))
 
 
-ifeq ($(BUILD_VERSION),)
-
-TARGET_VER = $(TARGET)
-
-else 
+ifdef BUILD_VERSION
 
 BUILD_VERSION_BCD = 0x$(subst .,,$(BUILD_VERSION))
 
@@ -65,6 +61,11 @@
 
 TARGET_VER = $(addsuffix _v$(BUILD_VERSION), $(TARGET))
 
+else
+
+TARGET_VER = $(TARGET)
+BUILD_VERSION_BCD = 0xFFFF
+
 endif