diff --git a/lib/editline/Makefile.am b/lib/editline/Makefile.am
index 231719090..1a5993b00 100644
--- a/lib/editline/Makefile.am
+++ b/lib/editline/Makefile.am
@@ -3,11 +3,10 @@
 include $(top_srcdir)/Makefile.am.common
 
 if do_roken_rename
-IS = -DROKEN_RENAME
 ES = snprintf.c strdup.c
 endif
 
-INCLUDES += $(IS)
+INCLUDES += $(ROKEN_RENAME)
 
 man_MANS = editline.3
 
diff --git a/lib/sl/Makefile.am b/lib/sl/Makefile.am
index b6df20bf4..691dcbe73 100644
--- a/lib/sl/Makefile.am
+++ b/lib/sl/Makefile.am
@@ -3,11 +3,10 @@
 include $(top_srcdir)/Makefile.am.common
 
 if do_roken_rename
-IS = -DROKEN_RENAME
 ES = strtok_r.c snprintf.c strdup.c strupr.c getprogname.c
 endif
 
-INCLUDES += $(IS)
+INCLUDES += $(ROKEN_RENAME)
 
 YFLAGS = -d