diff --git a/debian/control-modules b/debian/control-modules
index 55f73c4532..1255b8ef40 100644
--- a/debian/control-modules
+++ b/debian/control-modules
@@ -150,6 +150,7 @@ Description: Nibblebill
 Module: applications/mod_osp
 Description: Open Settlement Protocol
  This module adds support for the Open Settlement Protocol (OSP).
+Build-Depends: libosptk3-dev
 
 Module: applications/mod_rad_auth
 Description: RADIUS AA