diff --git a/apps/openssl.c b/apps/openssl.c
index 45af2ba7f..e0d89d4ab 100644
--- a/apps/openssl.c
+++ b/apps/openssl.c
@@ -163,7 +163,7 @@ static void lock_dbg_cb(int mode, int type, const char *file, int line)
 		goto err;
 		}
 
-	if (type < 0 || type > CRYPTO_NUM_LOCKS)
+	if (type < 0 || type >= CRYPTO_NUM_LOCKS)
 		{
 		errstr = "type out of bounds";
 		goto err;
diff --git a/ssl/ssltest.c b/ssl/ssltest.c
index 47c383200..42289c255 100644
--- a/ssl/ssltest.c
+++ b/ssl/ssltest.c
@@ -290,7 +290,7 @@ static void lock_dbg_cb(int mode, int type, const char *file, int line)
 		goto err;
 		}
 
-	if (type < 0 || type > CRYPTO_NUM_LOCKS)
+	if (type < 0 || type >= CRYPTO_NUM_LOCKS)
 		{
 		errstr = "type out of bounds";
 		goto err;