diff --git a/src/as/Makefile.Vx b/src/as/Makefile.Vx
index fa711a9d4..8a3d70ad9 100644
--- a/src/as/Makefile.Vx
+++ b/src/as/Makefile.Vx
@@ -14,7 +14,7 @@ LIBOBJS = \
 
 LIBNAME = asLibrary
 
-depends: $(OBDIR)/asLib.c
+pre_build: $(OBDIR)/asLib.c
 
 $(OBDIR)/asLib.c: asLib.y $(OBDIR)/asLib_lex.c
 	$(YACC) -l asLib.y
diff --git a/src/libCom/Makefile.Vx b/src/libCom/Makefile.Vx
index da230a2e8..efeac6ae7 100644
--- a/src/libCom/Makefile.Vx
+++ b/src/libCom/Makefile.Vx
@@ -53,7 +53,7 @@ $(EPICS_BASE_LIB)/$(T_A)/$(LIBNAME1): $(OBDIR)/$(LIBNAME1)
 $(EPICS_BASE_LIB)/$(T_A)/$(LIBNAME2): $(OBDIR)/$(LIBNAME2)
 	install -m 644 $? $@
 
-depends: bld_errSym
+pre_build: bld_errSym
 
 bld_errSym: $(OBDIR)/errSymTbl.c $(OBDIR)/errInc.o