diff --git a/App/tools/driver.makefile b/App/tools/driver.makefile
index 9b1d1c1..6187a13 100644
--- a/App/tools/driver.makefile
+++ b/App/tools/driver.makefile
@@ -123,7 +123,7 @@ BUILD_EPICS_VERSIONS = $(filter ${INSTALLED_EPICS_VERSIONS},${EPICS_VERSIONS})
 $(foreach v,$(sort $(basename ${BUILD_EPICS_VERSIONS})),$(eval EPICS_VERSIONS_$v=$(filter $v.%,${BUILD_EPICS_VERSIONS})))
 
 #check only what is needed to build the lib? But what is that?
-VERSIONCHECKFILES = $(filter_out /%, ${SOURCES} ${DBDS} ${TEMPLATES} ${SCRIPTS} $(foreach v,3.13 3.14 3.15, ${SOURCES_$v} ${DBDS_$v}))
+VERSIONCHECKFILES = $(filter-out /%, ${SOURCES} ${DBDS} ${TEMPLATES} ${SCRIPTS} $(foreach v,3.13 3.14 3.15, ${SOURCES_$v} ${DBDS_$v}))
 VERSIONCHECKCMD = ${MAKEHOME}/getVersion.tcl ${VERSIONDEBUGFLAG} ${VERSIONCHECKFILES}
 LIBVERSION = $(or $(filter-out test,$(shell ${VERSIONCHECKCMD} 2>/dev/null)),${USER},test)
 VERSIONDEBUGFLAG = $(if ${VERSIONDEBUG}, -d)