diff --git a/dlls/wined3d/glsl_shader.c b/dlls/wined3d/glsl_shader.c
index c137875821f..8b3a25e276b 100644
--- a/dlls/wined3d/glsl_shader.c
+++ b/dlls/wined3d/glsl_shader.c
@@ -8854,9 +8854,9 @@ static void shader_glsl_ffp_vertex_lighting_footer(struct wined3d_string_buffer
     shader_addline(buffer, "diffuse += clamp(dot(dir, normal), 0.0, 1.0)"
             " * ffp_light[%u].diffuse.xyz * att;\n", idx);
     if (settings->localviewer)
-        shader_addline(buffer, "t = dot(normal, normalize(dir - normalize(ec_pos.xyz)));\n");
+        shader_addline(buffer, "t = dot(normal, ffp_normalize(dir - ffp_normalize(ec_pos.xyz)));\n");
     else
-        shader_addline(buffer, "t = dot(normal, normalize(dir + vec3(0.0, 0.0, -1.0)));\n");
+        shader_addline(buffer, "t = dot(normal, ffp_normalize(dir + vec3(0.0, 0.0, -1.0)));\n");
     shader_addline(buffer, "if (dot(dir, normal) > 0.0 && t > 0.0%s) specular +="
             " pow(t, ffp_material.shininess) * ffp_light[%u].specular * att;\n",
             legacy_lighting ? " && ffp_material.shininess > 0.0" : "", idx);