diff --git a/c/src/exec/posix/src/Makefile.in b/c/src/exec/posix/src/Makefile.in
index 5e73bfd5e8..fb6146dc10 100644
--- a/c/src/exec/posix/src/Makefile.in
+++ b/c/src/exec/posix/src/Makefile.in
@@ -43,7 +43,7 @@ PSIGNAL_PIECES=\
   psignal alarm kill killinfo pause pthreadkill pthreadsigmask \
   sigaction sigaddset sigdelset sigemptyset sigfillset sigismember \
   sigpending sigprocmask sigqueue sigsuspend sigtimedwait sigwait \
-  sigwaitinfo
+  sigwaitinfo signal_2
 
 C_PIECES= adasupp cond getpid key mutex $(PTHREAD_PIECES) \
   $(PSIGNAL_PIECES) ptimer sched time \