diff --git a/hw/xbox/nv2a/pgraph/vk/shaders.c b/hw/xbox/nv2a/pgraph/vk/shaders.c
index 421a81ba60..5d6e345ffb 100644
--- a/hw/xbox/nv2a/pgraph/vk/shaders.c
+++ b/hw/xbox/nv2a/pgraph/vk/shaders.c
@@ -313,6 +313,9 @@ static void update_shader_constant_locations(ShaderBinding *binding)
 
     binding->uniform_attrs_loc =
         uniform_index(&binding->vertex->uniforms, "inlineValue");
+
+    binding->specular_power_loc =
+        uniform_index(&binding->vertex->uniforms, "specularPower");
 }
 
 static void shader_cache_entry_init(Lru *lru, LruNode *node, void *state)
@@ -607,6 +610,11 @@ static void shader_update_constants(PGRAPHState *pg, ShaderBinding *binding,
             }
         }
 
+        if (binding->specular_power_loc != -1) {
+            uniform1f(&binding->vertex->uniforms, binding->specular_power_loc,
+                      pg->specular_power);
+        }
+
         /* estimate the viewport by assuming it matches the surface ... */
         unsigned int aa_width = 1, aa_height = 1;
         pgraph_apply_anti_aliasing_factor(pg, &aa_width, &aa_height);