diff --git a/instlib/source/Makefile.proto b/instlib/source/Makefile.proto
index 0d0dd3e..ae9e422 100644
--- a/instlib/source/Makefile.proto
+++ b/instlib/source/Makefile.proto
@@ -19,9 +19,9 @@ DEPENDS = $(OBJS) dmemory.o machine_c.o
 
 # the default is to make the cns executable
 cns_solve:
-	@ make -k printflags       F77BUG="$(debug)" DEBUG="$(debug)"
-	@ make -k ../bin/cns_solve F77BUG="$(debug)" DEBUG="$(debug)"
-	@ make -k exepurge
+	@ make printflags       F77BUG="$(debug)" DEBUG="$(debug)"
+	@ make ${MAKEOPTS} ../bin/cns_solve F77BUG="$(debug)" DEBUG="$(debug)"
+	@ make exepurge
 
 # rule for the fortran routines
 $(OBJS):