diff --git a/databases/Makefile b/databases/Makefile
index 4e6c57a2bf46..d12201726974 100644
--- a/databases/Makefile
+++ b/databases/Makefile
@@ -8,6 +8,7 @@
     SUBDIR += db
     SUBDIR += db3
     SUBDIR += db3-latest
+    SUBDIR += db4
     SUBDIR += dbconnect
     SUBDIR += dbf2mysql
     SUBDIR += dbmetrix