diff --git a/scripts/build.py b/scripts/build.py
index 2c6b334e..0f12a4fb 100644
--- a/scripts/build.py
+++ b/scripts/build.py
@@ -120,7 +120,6 @@ proj_base=pwd.getpwuid(os.getuid()).pw_dir + "/local/src/jw.dev/proj"
 search_path=[".", "dspc/src", "dspc/src/dspcd-plugins", "dspc/src/io" ]
 dep_cache = {}
 my_dir=os.path.dirname(os.path.realpath(__file__))
-projects_py="/usr/bin/python " + my_dir + "/projects.py"
 
 # -- parse command line
 parser = argparse.ArgumentParser(description='jannet software project build tool')
@@ -141,6 +140,7 @@ modules=args.modules
 exclude=args.exclude.split()
 proj_base=args.base
 target=args.target
+projects_py="/usr/bin/python " + my_dir + "/projects.py --prefix " + proj_base
 
 env_exclude=os.getenv('BUILD_EXCLUDE', '')
 if len(env_exclude):