diff --git a/crypto/drbg.c b/crypto/drbg.c
index b69409c..8d2944f 100644
--- a/crypto/drbg.c
+++ b/crypto/drbg.c
@@ -487,7 +487,7 @@
 
 out:
 	memset(iv, 0, drbg_blocklen(drbg));
-	memset(temp, 0, drbg_statelen(drbg));
+	memset(temp, 0, drbg_statelen(drbg) + drbg_blocklen(drbg));
 	memset(pad, 0, drbg_blocklen(drbg));
 	return ret;
 }