diff --git a/drivers/char/random.c b/drivers/char/random.c
index 9add8f4ace03ed8523da851cc765804ee4bcbe0a..d6a96e82cf9ec12c7e87b8053b7f6ffa640b7003 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -1306,7 +1306,8 @@ void add_interrupt_randomness(int irq, int irq_flags)
 	}
 
 	if ((fast_pool->count < 64) &&
-	    !time_after(now, fast_pool->last + HZ))
+	    !time_after(now, fast_pool->last + HZ) &&
+	    crng_ready())
 		return;
 
 	if (!seed_inited) {