diff --git a/share/mk/bsd.progs.mk b/share/mk/bsd.progs.mk
index 3f0d7f25c78c..8d0fe8eb1ba7 100644
--- a/share/mk/bsd.progs.mk
+++ b/share/mk/bsd.progs.mk
@@ -62,7 +62,8 @@ UPDATE_DEPENDFILE = NO
 
 # These are handled by the main make process.
 .ifdef _RECURSING_PROGS
-_PROGS_GLOBAL_VARS= CLEANFILES CLEANDIRS FILESGROUPS SCRIPTS CONFGROUPS
+_PROGS_GLOBAL_VARS= CLEANFILES CLEANDIRS CONFGROUPS FILESGROUPS INCSGROUPS \
+		    SCRIPTS
 .for v in ${_PROGS_GLOBAL_VARS}
 $v =
 .endfor