diff --git a/tools/building.py b/tools/building.py
index 79e6fd1a4b06657c9f074d141e4017f2fca3eb90..0bdaa8696b45155c9db9338e49463e02ccfe8d35 100644
--- a/tools/building.py
+++ b/tools/building.py
@@ -364,9 +364,10 @@ def DefineGroup(name, src, depend, **parameters):
     if group.has_key('LIBPATH'):
         Env.Append(LIBPATH = group['LIBPATH'])
 
-    objs = Env.Object(group['src'])
     if group.has_key('LIBRARY'):
-        objs = Env.Library(name, objs)
+        objs = Env.Library(name, group['src'])
+    else:
+        objs = group['src']
 
     # merge group 
     for g in Projects: