diff --git a/src/gpu/jit/conv/config_plan.cpp b/src/gpu/jit/conv/config_plan.cpp
index d8ce7fb0372..7df7d7bd573 100644
--- a/src/gpu/jit/conv/config_plan.cpp
+++ b/src/gpu/jit/conv/config_plan.cpp
@@ -2080,7 +2080,7 @@ class plan_builder_t {
                                    vec_size, a_layout, b_layout, 1, -1)) {
                     m_blk = vec_size;
                     c_blk_layout = c_blk_layout.add_outer_block(1, vec_size);
-                } else if (cfg_.prb().g > 1
+                } else if (cfg_.prb().g > 1 && cfg_.prb().g < 16
                         && (a_layout.blocks()[0].block
                                    * a_layout.blocks()[1].block)
                                         % vec_size