diff --git a/drivers/char/random.c b/drivers/char/random.c
index 1ef94d112521..29886cde114e 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -976,7 +976,7 @@ static void mix_interrupt_randomness(struct work_struct *work)
 	local_irq_enable();
 
 	mix_pool_bytes(pool, sizeof(pool));
-	credit_init_bits(max(1u, (count & U16_MAX) / 64));
+	credit_init_bits(clamp_t(unsigned int, (count & U16_MAX) / 64, 1, sizeof(pool) * 8));
 
 	memzero_explicit(pool, sizeof(pool));
 }