diff --git a/minix/servers/ds/Makefile b/minix/servers/ds/Makefile
index 6619f5448..649611c18 100644
--- a/minix/servers/ds/Makefile
+++ b/minix/servers/ds/Makefile
@@ -5,4 +5,11 @@ SRCS=	main.c store.c
 DPADD+=	${LIBSYS}
 LDADD+=	-lsys
 
+# FIXME: workaround for the linker pass not seeing weak symbols. The
+# following symbols are essential for magic instrumentation, since they
+# perform memory de/allocation. For some reason, their weak versions are
+# not picked up by the linker in the first (instrumentation) pass. With
+# these definitions we force the first pass to include them.
+CPPFLAGS.store.c+= -Dregcomp=_regcomp -Dregfree=_regfree
+
 .include <minix.service.mk>