diff --git a/package/common/coreperl b/package/common/coreperl
index 2077f6e3a..f69009654 100644
--- a/package/common/coreperl
+++ b/package/common/coreperl
@@ -9,6 +9,7 @@ Getopt::Long
 Unicode::Normalize 
 Tie::Handle
 Time::Local 
+Thread::Semaphore
 Math::Trig 
 IO::Socket 
 Errno