diff --git a/src/gallium/tests/trivial/quad-tex.c b/src/gallium/tests/trivial/quad-tex.c
index 93f24876cbb..abcd477f81e 100644
--- a/src/gallium/tests/trivial/quad-tex.c
+++ b/src/gallium/tests/trivial/quad-tex.c
@@ -271,7 +271,7 @@ static void init_prog(struct program *p)
 	}
 
 	/* fragment shader */
-	p->fs = util_make_fragment_tex_shader(p->pipe, TGSI_TEXTURE_2D);
+	p->fs = util_make_fragment_tex_shader(p->pipe, TGSI_TEXTURE_2D, TGSI_INTERPOLATE_LINEAR);
 }
 
 static void close_prog(struct program *p)