diff --git a/dlls/wined3d/glsl_shader.c b/dlls/wined3d/glsl_shader.c
index 215090c9b13..46965bf876b 100644
--- a/dlls/wined3d/glsl_shader.c
+++ b/dlls/wined3d/glsl_shader.c
@@ -1401,7 +1401,7 @@ void pshader_glsl_input_pack(
                if (usage_idx == 0)
                    shader_addline(buffer, "IN%lu%s = vec4(gl_Color)%s;\n",
                        i, reg_mask, reg_mask);
-               if (usage_idx == 1)
+               else if (usage_idx == 1)
                    shader_addline(buffer, "IN%lu%s = vec4(gl_SecondaryColor)%s;\n",
                        i, reg_mask, reg_mask);
                else