diff --git a/libc/Android.mk b/libc/Android.mk
index fd7c54f..9c5e785 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -156,6 +156,7 @@
     bionic/pthread_exit.cpp \
     bionic/pthread_getcpuclockid.cpp \
     bionic/pthread_getschedparam.cpp \
+    bionic/pthread_gettid_np.cpp \
     bionic/pthread_internals.cpp \
     bionic/pthread_join.cpp \
     bionic/pthread_key.cpp \