diff --git a/hw/xbox/nv2a/pgraph/gl/shaders.c b/hw/xbox/nv2a/pgraph/gl/shaders.c
index f47105980c0..3095ca3c3aa 100644
--- a/hw/xbox/nv2a/pgraph/gl/shaders.c
+++ b/hw/xbox/nv2a/pgraph/gl/shaders.c
@@ -712,9 +712,9 @@ static void shader_update_constants(PGRAPHState *pg, ShaderBinding *binding,
         }
     }
     if (binding->alpha_ref_loc != -1) {
-        float alpha_ref = GET_MASK(pgraph_reg_r(pg, NV_PGRAPH_CONTROL_0),
-                                   NV_PGRAPH_CONTROL_0_ALPHAREF) / 255.0;
-        glUniform1f(binding->alpha_ref_loc, alpha_ref);
+        int alpha_ref = GET_MASK(pgraph_reg_r(pg, NV_PGRAPH_CONTROL_0),
+                                   NV_PGRAPH_CONTROL_0_ALPHAREF);
+        glUniform1i(binding->alpha_ref_loc, alpha_ref);
     }
 
 
diff --git a/hw/xbox/nv2a/pgraph/glsl/psh.c b/hw/xbox/nv2a/pgraph/glsl/psh.c
index 9775db2a8ab..44c56a9c9ba 100644
--- a/hw/xbox/nv2a/pgraph/glsl/psh.c
+++ b/hw/xbox/nv2a/pgraph/glsl/psh.c
@@ -743,7 +743,7 @@ static MString* psh_convert(struct PixelShader *ps)
                            "layout(location = 0) out vec4 fragColor;\n");
     }
 
-    mstring_append_fmt(preflight, "%sfloat alphaRef;\n"
+    mstring_append_fmt(preflight, "%sint alphaRef;\n"
                                   "%svec4  fogColor;\n"
                                   "%sivec4 clipRegion[8];\n",
                                   u, u, u);
@@ -1190,7 +1190,9 @@ static MString* psh_convert(struct PixelShader *ps)
                 assert(false);
                 break;
             }
-            mstring_append_fmt(ps->code, "if (!(fragColor.a %s alphaRef)) discard;\n",
+            mstring_append_fmt(ps->code,
+                               "int fragAlpha = int(round(fragColor.a * 255.0));\n"
+                               "if (!(fragAlpha %s alphaRef)) discard;\n",
                                alpha_op);
         }
     }
diff --git a/hw/xbox/nv2a/pgraph/vk/shaders.c b/hw/xbox/nv2a/pgraph/vk/shaders.c
index 1f4ad765de2..5fce943d490 100644
--- a/hw/xbox/nv2a/pgraph/vk/shaders.c
+++ b/hw/xbox/nv2a/pgraph/vk/shaders.c
@@ -477,10 +477,9 @@ static void shader_update_constants(PGRAPHState *pg, ShaderBinding *binding,
         }
     }
     if (binding->alpha_ref_loc != -1) {
-        float alpha_ref = GET_MASK(pgraph_reg_r(pg, NV_PGRAPH_CONTROL_0),
-                                   NV_PGRAPH_CONTROL_0_ALPHAREF) /
-                          255.0;
-        uniform1f(&binding->fragment->uniforms, binding->alpha_ref_loc,
+        int alpha_ref = GET_MASK(pgraph_reg_r(pg, NV_PGRAPH_CONTROL_0),
+                                   NV_PGRAPH_CONTROL_0_ALPHAREF);
+        uniform1i(&binding->fragment->uniforms, binding->alpha_ref_loc,
                          alpha_ref);
     }