diff --git a/sys/x86/x86/mp_x86.c b/sys/x86/x86/mp_x86.c
index 11b11471d73..c52102e2de1 100644
--- a/sys/x86/x86/mp_x86.c
+++ b/sys/x86/x86/mp_x86.c
@@ -1427,6 +1427,9 @@ ipi_all_but_self(u_int ipi)
 	cpuset_t other_cpus;
 	int cpu, c;
 
+	if (mp_ncpus == 1)
+		return;
+
 	/*
 	 * IPI_STOP_HARD maps to a NMI and the trap handler needs a bit
 	 * of help in order to understand what is the source.