diff --git a/kernel/irq/matrix.c b/kernel/irq/matrix.c
index a3cbbc8191c52da53a1b522db248aa79528bb13f..7df2480005f863693f20d5450515d85085c225b6 100644
--- a/kernel/irq/matrix.c
+++ b/kernel/irq/matrix.c
@@ -384,7 +384,7 @@ unsigned int irq_matrix_available(struct irq_matrix *m, bool cpudown)
 {
 	struct cpumap *cm = this_cpu_ptr(m->maps);
 
-	return m->global_available - cpudown ? cm->available : 0;
+	return (m->global_available - cpudown) ? cm->available : 0;
 }
 
 /**