diff --git a/config/CONFIG_COMMON b/config/CONFIG_COMMON
index def30821b..7b0b873aa 100644
--- a/config/CONFIG_COMMON
+++ b/config/CONFIG_COMMON
@@ -39,8 +39,8 @@ EPICS_EXTENSIONS_TEMPLATES    = $(EPICS_EXTENSIONS)/templates
 DIVIDER = .
 
 # private versions of lex/yacc from EPICS
-EYACC = $(EPICS_BASE)/bin/$(HOST_ARCH)/antelope
-ELEX = $(EPICS_BASE)/bin/$(HOST_ARCH)/e_flex -S$(EPICS_BASE_INCLUDE)/flex.skel.static
+EYACC = $(EPICS_BASE)/bin/$(HOST_ARCH)/antelope$(EXE)
+ELEX = $(EPICS_BASE)/bin/$(HOST_ARCH)/e_flex$(EXE) -S$(EPICS_BASE_INCLUDE)/flex.skel.static
 
 # install from EPICS
 INSTALL = $(EPICS_BASE)/bin/$(HOST_ARCH)/installEpics