diff --git a/crypto/drbg.c b/crypto/drbg.c
index 30ec2a624b70..57fd479b8f77 100644
--- a/crypto/drbg.c
+++ b/crypto/drbg.c
@@ -1741,6 +1741,8 @@ static inline int __init drbg_healthcheck_sanity(void)
 	if (!drbg)
 		return -ENOMEM;
 
+	mutex_init(&drbg->drbg_mutex);
+
 	/*
 	 * if the following tests fail, it is likely that there is a buffer
 	 * overflow as buf is much smaller than the requested or provided