diff --git a/src/SConscript b/src/SConscript
index a680c72..6d35421 100644
--- a/src/SConscript
+++ b/src/SConscript
@@ -6,6 +6,8 @@ Import('env')
 
 files = Split("""
     basics.cc
+    object.cc
+    object_sphere.cc
 """)
 
 lib = env.Library('charles', files)