1 files changed, 1 insertions, 0 deletions
diff --git a/Makefile.am b/Makefile.am
index f7ce9e377..9c789ced2 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -299,6 +299,7 @@ libsystem_a_SOURCES = \
 	src/system/EventFD.cxx src/system/EventFD.hxx \
 	src/system/SignalFD.cxx src/system/SignalFD.hxx \
 	src/system/EPollFD.cxx src/system/EPollFD.hxx \
+	src/system/PeriodClock.hxx \
 	src/system/Clock.cxx src/system/Clock.hxx
 
 # Event loop library