diff --git a/panda/src/ipc/Sources.pp b/panda/src/ipc/Sources.pp
index ff491136d6..cd5d815bea 100644
--- a/panda/src/ipc/Sources.pp
+++ b/panda/src/ipc/Sources.pp
@@ -11,11 +11,11 @@
   #define COMBINED_SOURCES $[TARGET]_composite1.cxx  
   
   #define SOURCES                                                       \
-    ipc.cxx ipc_atomics.h ipc_condition.h ipc_file.I ipc_file.h \
+    ipc_atomics.h ipc_condition.h ipc_file.I ipc_file.h \
     ipc_library.h ipc_mach_traits.h ipc_mutex.h ipc_nspr_traits.h \
     ipc_nt_traits.h ipc_posix_traits.h \
     ipc_ps2_traits.h ipc_semaphore.h ipc_solaris_traits.h ipc_thread.h \
-    ipc_traits.cxx ipc_traits.h
+    ipc_traits.h
     
   #define INCLUDED_SOURCES                                                       \
     ipc.cxx ipc_traits.cxx