diff --git a/example/speech-demo/python_wrap/Makefile b/example/speech-demo/python_wrap/Makefile
index 0c76e9e973a1..2c020b0d8757 100644
--- a/example/speech-demo/python_wrap/Makefile
+++ b/example/speech-demo/python_wrap/Makefile
@@ -8,6 +8,6 @@ OBJFILES = ctypes.o
 
 LIBNAME = kaldi-python-wrap
 
-ADDLIBS = ../util/kaldi-util.a ../matrix/kaldi-matrix.a ../base/kaldi-base.a  ../hmm/kaldi-hmm.a ../cudamatrix/kaldi-cudamatrix.a ../nnet/kaldi-nnet.a
+ADDLIBS = ../util/kaldi-util.a ../matrix/kaldi-matrix.a ../base/kaldi-base.a  ../hmm/kaldi-hmm.a ../cudamatrix/kaldi-cudamatrix.a ../nnet/kaldi-nnet.a ../thread/kaldi-thread.a
 
 include ../makefiles/default_rules.mk