diff --git a/example/ck_tile/01_unified_attention/example_unified_attention.cpp b/example/ck_tile/01_unified_attention/example_unified_attention.cpp
index 6e3708acdd..b8c65d7c0a 100644
--- a/example/ck_tile/01_unified_attention/example_unified_attention.cpp
+++ b/example/ck_tile/01_unified_attention/example_unified_attention.cpp
@@ -32,7 +32,7 @@ auto parse_cmd_args(int argc, char* argv[]) -> std::pair<bool, ck_tile::ArgParse
         .insert("b", "3", "batch size")
         .insert("h", "32", "num of head, for q")
         .insert("h_k",
-                "8",
+                "-1",
                 "num of head, for k/v, -1 means equal to h\n"
                 "if not equal to h, then this is GQA/MQA case")
         .insert("s", "1024", "max_seqlen_q")
@@ -103,6 +103,10 @@ struct Problem
         BLOCK_SIZE      = args.get_int("bs");
         nhead_q         = args.get_int("h");
         nhead_kv        = args.get_int("h_k");
+        if(nhead_kv < 0)
+        {
+            nhead_kv = nhead_q;
+        }
 
         hdim       = args.get_int("d");
         query_lens = args.get_int_vec("query_lens");