diff --git a/make/tail.mk b/make/tail.mk
index 2f01ee8..4b523c6 100644
--- a/make/tail.mk
+++ b/make/tail.mk
@@ -5,6 +5,9 @@
 export PATH := $(PATH):$(ORCA_BIN)
 
 CWD=$(shell pwd)
+OBJDIR:=$(abspath $(OBJDIR))
+GENDIR:=$(abspath $(GENDIR))
+TARGETDIR:=$(abspath $(TARGETDIR))
 
 DISKIMAGE=$(TARGETDIR)/$(PGM).2mg
 BUILDTARGET=$(DISKIMAGE)