diff --git a/config/RULES.Host b/config/RULES.Host
index 613be01c3..5b8e69c8a 100644
--- a/config/RULES.Host
+++ b/config/RULES.Host
@@ -225,7 +225,7 @@ endif
 #	(convenience for extensions and applications)
 ifneq ($(EPICS_BASE),$(TOP))
 ifneq ($(EPICS_BASE),$(INSTALL_LOCATION))
-EPICS_INCLUDES += -I$(EPICS_BASE_INCLUDE) -I$(EPICS_BASE_INCLUDE)/os/$(OS_CLASS)
+EPICS_INCLUDES += -I$(EPICS_BASE_INCLUDE)/os/$(OS_CLASS) -I$(EPICS_BASE_INCLUDE)
 EPICS_DBDFLAGS += -I $(EPICS_BASE)/dbd
 endif
 endif
diff --git a/config/RULES.Vx b/config/RULES.Vx
index b7d4565d7..075892200 100644
--- a/config/RULES.Vx
+++ b/config/RULES.Vx
@@ -39,7 +39,7 @@ MAN_DIRECTORY_TARGETS = $(foreach n, $(MANLIST),$(INSTALL_MAN)/man$(n))
 #	(convenience for extensions and applications)
 ifneq ($(EPICS_BASE),$(TOP))
 ifneq ($(EPICS_BASE),$(INSTALL_LOCATION))
-EPICS_INCLUDES += -I$(EPICS_BASE_INCLUDE) -I$(EPICS_BASE_INCLUDE)/os/$(OS_CLASS)
+EPICS_INCLUDES += -I$(EPICS_BASE_INCLUDE)/os/$(OS_CLASS) -I$(EPICS_BASE_INCLUDE)
 EPICS_DBDFLAGS += -I $(EPICS_BASE)/dbd
 endif
 endif