diff --git a/Makefile b/Makefile
index 9705ebef..c8f14c68 100644
--- a/Makefile
+++ b/Makefile
@@ -113,7 +113,7 @@ $(BIN)/wwdump_ww: selfhost/cmd/wwdump/main.ww \
 		selfhost/cmd/wcc/cgen.ww selfhost/cmd/wcc/cgenexpr.ww \
 		selfhost/cmd/wcc/cgenstmt.ww selfhost/cmd/wcc/cgenutil.ww \
 		selfhost/cmd/wcc/cgendecl.ww \
-		lib/os/os.ww lib/strconv/strconv.ww lib/ascii/ascii.ww lib/fmt/fmt.ww \
+		lib/os/os.ww lib/strconv/strconv.ww lib/strings/strings.ww lib/ascii/ascii.ww lib/fmt/fmt.ww \
 		$(BIN)/ww $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
 		$(LIB)/libwwrt.a | $(BIN)
 	cd $(BIN) && ./ww build \
@@ -134,7 +134,7 @@ $(BIN)/w6c_ww: selfhost/cmd/w6c/main.ww \
 		selfhost/cmd/wcc/cgen.ww selfhost/cmd/wcc/cgenexpr.ww \
 		selfhost/cmd/wcc/cgenstmt.ww selfhost/cmd/wcc/cgenutil.ww \
 		selfhost/cmd/wcc/cgendecl.ww \
-		lib/os/os.ww lib/strconv/strconv.ww lib/ascii/ascii.ww lib/fmt/fmt.ww \
+		lib/os/os.ww lib/strconv/strconv.ww lib/strings/strings.ww lib/ascii/ascii.ww lib/fmt/fmt.ww \
 		$(BIN)/ww $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
 		$(LIB)/libwwrt.a | $(BIN)
 	cd $(BIN) && ./ww build \