diff --git a/backends/vulkan/runtime/graph/ops/glsl/conv2d_pw_tiled.yaml b/backends/vulkan/runtime/graph/ops/glsl/conv2d_pw_tiled.yaml
index 037dfc35c89..82a6dcd24e2 100644
--- a/backends/vulkan/runtime/graph/ops/glsl/conv2d_pw_tiled.yaml
+++ b/backends/vulkan/runtime/graph/ops/glsl/conv2d_pw_tiled.yaml
@@ -11,7 +11,7 @@ conv2d_pw_tiled:
     TILE_M4: 1
     TILE_K4: 1
     TILE_N4: 1
-    TILE_M: 4
+    TILE_M: 2
   generate_variant_forall:
     DTYPE:
       - VALUE: float
diff --git a/backends/vulkan/runtime/graph/ops/impl/Conv2dPW.cpp b/backends/vulkan/runtime/graph/ops/impl/Conv2dPW.cpp
index 7c5f9f0bc0a..3c227448cf2 100644
--- a/backends/vulkan/runtime/graph/ops/impl/Conv2dPW.cpp
+++ b/backends/vulkan/runtime/graph/ops/impl/Conv2dPW.cpp
@@ -79,8 +79,8 @@ GlobalWorkGrid pick_conv2d_pw_tiled_gwg(
   uint32_t C_out = graph->size_at<uint32_t>(-3, out);
   uint32_t M = H * W;
   uint32_t N4 = utils::div_up_4(C_out);
-  // TILE_N4=1, TILE_M=4
-  return GlobalWorkGrid({N4, utils::div_up(M, 4u), 1u}, kTiledWorkGrid);
+  // TILE_N4=1, TILE_M=2. Must match conv2d_pw_tiled.yaml.
+  return GlobalWorkGrid({N4, utils::div_up(M, 2u), 1u}, kTiledWorkGrid);
 }
 
 //