diff --git a/attentionbench/attention_utils.py b/attentionbench/attention_utils.py
index cc9793d..863755d 100644
--- a/attentionbench/attention_utils.py
+++ b/attentionbench/attention_utils.py
@@ -69,8 +69,8 @@ def get_lowering_config(self) -> str:
         return (
             f"#iree_gpu.lowering_config<"
             + "{ "
-            + f"workgroup = [{",".join([str(x) for x in self.wg_tiles])}], "
-            + f"reduction = [{",".join([str(x) for x in self.red_tiles])}]"
+            + f"workgroup = [{','.join([str(x) for x in self.wg_tiles])}], "
+            + f"reduction = [{','.join([str(x) for x in self.red_tiles])}]"
             + " }"
             + f">"
         )