diff --git a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
index 0b17dc7e712..b52690b920f 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
@@ -868,7 +868,13 @@ fs_visitor::emit_texture_gen4(ir_texture *ir, fs_reg dst, fs_reg coordinate,
 	 emit(MOV(fs_reg(MRF, base_mrf + mlen + i), coordinate));
 	 coordinate.reg_offset++;
       }
-      /* gen4's SIMD8 sampler always has the slots for u,v,r present. */
+
+      /* gen4's SIMD8 sampler always has the slots for u,v,r present.
+       * the unused slots must be zeroed.
+       */
+      for (int i = ir->coordinate->type->vector_elements; i < 3; i++) {
+         emit(MOV(fs_reg(MRF, base_mrf + mlen + i), fs_reg(0.0f)));
+      }
       mlen += 3;
 
       if (ir->op == ir_tex) {