--- ./tools/crm_mon.c.orig
+++ ./tools/crm_mon.c
@@ -518,7 +518,7 @@
 
 #if !defined (ON_DARWIN) && !defined (ON_BSD)
     /* prevent zombies */
-    signal(SIGCLD, SIG_IGN);
+    signal(SIGCHLD, SIG_IGN);
 #endif
 
     if (strcmp(crm_system_name, "crm_mon.cgi") == 0) {