diff --git a/configure/RULES.Db b/configure/RULES.Db
index 2335d6796..1ec7d87cb 100644
--- a/configure/RULES.Db
+++ b/configure/RULES.Db
@@ -154,10 +154,10 @@ $(INSTALL_DBD)/bpt%.dbd: ../bpt%.data
 	$(MAKEBPT) $< $@
 
 ifdef DBDEXPAND
-$(INSTALL_DBD)/$(DBDNAME): ../$(DBDEXPAND)
+$(INSTALL_DBD)/$(DBDNAME): $(addprefix ../,$(DBDEXPAND))
 	@echo "Expanding dbd"
 	@$(RM) $@
-	$(DBEXPAND) $(USR_DBDFLAGS) $< > $@
+	$(DBEXPAND) $(USR_DBDFLAGS) $^ > $@
 endif
 
 ##################################################### Dependencies
diff --git a/configure/RULES_BUILD b/configure/RULES_BUILD
index 11f31978c..99b57f04b 100644
--- a/configure/RULES_BUILD
+++ b/configure/RULES_BUILD
@@ -300,10 +300,10 @@ $(INSTALL_DBD)/bpt%.dbd: ../bpt%.data
 	$(EPICS_BASE_HOST_BIN)/makeBpt$(HOSTEXE) $< $@
 
 ifdef DBDEXPAND
-$(INSTALL_DBD)/$(DBDNAME): ../$(DBDEXPAND)
+$(INSTALL_DBD)/$(DBDNAME): $(addprefix ../,$(DBDEXPAND))
 	@echo Expanding dbd
 	@$(RM) $@
-	$(EPICS_BASE_HOST_BIN)/dbExpand$(HOSTEXE) $(DBDFLAGS) $< > $@
+	$(EPICS_BASE_HOST_BIN)/dbExpand$(HOSTEXE) $(DBDFLAGS) $^ > $@
 endif
 
 # WIN95/NT source browser