diff --git a/src/pkg/runtime/os_linux.c b/src/pkg/runtime/os_linux.c
index 77754f481c..b9ac8c619c 100644
--- a/src/pkg/runtime/os_linux.c
+++ b/src/pkg/runtime/os_linux.c
@@ -312,7 +312,8 @@ runtime·setsig(int32 i, GoSighandler *fn, bool restart)
 	if(fn == runtime·sighandler)
 		fn = (void*)runtime·sigtramp;
 	sa.sa_handler = fn;
-	if(runtime·rt_sigaction(i, &sa, nil, sizeof(sa.sa_mask)) != 0)
+	// Qemu rejects rt_sigaction of SIGRTMAX (64).
+	if(runtime·rt_sigaction(i, &sa, nil, sizeof(sa.sa_mask)) != 0 && i != 64)
 		runtime·throw("rt_sigaction failure");
 }