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--- a/Makefile.am
+++ b/Makefile.am
@@ -33,7 +33,9 @@
      src/ohvolume.hxx \
      src/ohvolume.cxx \
      src/ohplaylist.hxx \
-     src/ohplaylist.cxx
+     src/ohplaylist.cxx \
+     src/ptmutex.hxx \
+     src/workqueue.hxx
                            
 upmpdcli_LDADD = -lupnpp -lmpdclient -lpthread