diff --git a/Makefile b/Makefile
index 7786f79..f32d8b6 100644
--- a/Makefile
+++ b/Makefile
@@ -69,4 +69,4 @@ $(TESTSSRCDIR)/src/precomp.hpp:
 	cd $(TESTSSRCDIR) && ln -fs ../../src/precomp.hpp precomp.hpp
 
 $(HOME)/.config/mkprojrc:
-	echo "$(DATADIR)" > $@
+	echo "tplroot=$(DATADIR)" > $@