diff --git a/drivers/char/random.c b/drivers/char/random.c
index 401a2cce29efe36ac74f4eb42ae4dc9fa5ea4f9a..280ba163cf8b3eb01ddc3f9d9761ea370b9e87e9 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -1269,7 +1269,8 @@ 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;
 
 	r = &input_pool;