diff --git a/glafp-utils/mkdependC/Makefile b/glafp-utils/mkdependC/Makefile
index 1f6f23878fdf493a96501b51000b4a905f4ccc68..d14fd379a68dde80f1c7ed5049b718080782a142 100644
--- a/glafp-utils/mkdependC/Makefile
+++ b/glafp-utils/mkdependC/Makefile
@@ -13,7 +13,7 @@ SCRIPT_OBJS=mkdependC.prl
 # Prepend (perl) bindings for these Makefile variables
 # when creating `mkdependC' (a more flexible way of doing msub).
 #
-SCRIPT_SUBST_VARS=RAWCPP HOSTPLATFORM
+SCRIPT_SUBST_VARS=TMPDIR CPP
 
 CLEAN_FILES += $(SCRIPT_PROG)
 INTERP=perl