diff --git a/tests/libtest/Makefile.inc b/tests/libtest/Makefile.inc
index c3222abe60..72bd3456bf 100644
--- a/tests/libtest/Makefile.inc
+++ b/tests/libtest/Makefile.inc
@@ -800,7 +800,7 @@ lib2302_LDADD = $(TESTUTIL_LIBS)
 lib2304_SOURCES = lib2304.c $(SUPPORTFILES)
 lib2304_LDADD = $(TESTUTIL_LIBS)
 
-lib2305_SOURCES = lib2305.c $(SUPPORTFILES) $(TESTUTIL) $(TSTTRACE)
+lib2305_SOURCES = lib2305.c $(SUPPORTFILES) $(TESTUTIL) $(TSTTRACE) $(MULTIBYTE)
 lib2305_LDADD = $(TESTUTIL_LIBS)
 
 lib2402_SOURCES = lib2402.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)