diff --git a/apps/speed.c b/apps/speed.c
index 3cb93ecf12..56c896c31e 100644
--- a/apps/speed.c
+++ b/apps/speed.c
@@ -2114,7 +2114,7 @@ int speed_main(int argc, char **argv)
         if (doit[algindex]) {
             int st = 1;
 
-            keylen = 16 + i * 8;
+            keylen = 16 + k * 8;
             for (i = 0; st && i < loopargs_len; i++) {
                 loopargs[i].ctx = init_evp_cipher_ctx(names[algindex],
                                                       key32, keylen);