diff --git a/tests/unit/test_umma_qk.cu b/tests/unit/test_umma_qk.cu
index 82416d16..0097f1ed 100644
--- a/tests/unit/test_umma_qk.cu
+++ b/tests/unit/test_umma_qk.cu
@@ -78,9 +78,12 @@ test_umma_qk_hd16(
     }
     __syncthreads();
 
-    // Zero TMEM — test just 1 store call, no fence
+    // Zero TMEM — test 2 stores with syncwarp between them
     if (wid == 0) {
         tmem_store(tmem_base, 0, 0, 0, 0);
+        __syncwarp();
+        tmem_store(tmem_base + 1, 0, 0, 0, 0);
+        __syncwarp();
     }
     __syncthreads();