diff --git a/src/charon/daemon.c b/src/charon/daemon.c
index 644611170..0689c448e 100644
--- a/src/charon/daemon.c
+++ b/src/charon/daemon.c
@@ -20,7 +20,9 @@
 #ifdef HAVE_PRCTL
 #include <sys/prctl.h>
 #endif
+#define _POSIX_PTHREAD_SEMANTICS /* for two param sigwait on OpenSolaris */
 #include <signal.h>
+#undef _POSIX_PTHREAD_SEMANTICS
 #include <pthread.h>
 #include <sys/stat.h>
 #include <sys/types.h>