diff --git a/src/gallium/auxiliary/util/u_tile.c b/src/gallium/auxiliary/util/u_tile.c
index 48e73c40ba7..a1d55adf7ad 100644
--- a/src/gallium/auxiliary/util/u_tile.c
+++ b/src/gallium/auxiliary/util/u_tile.c
@@ -810,7 +810,7 @@ pipe_put_tile_z(struct pipe_context *pipe,
       break;
    case PIPE_FORMAT_Z32_FLOAT:
       {
-         float *pDest = (float *) (map + y * pt->stride + x*2);
+         float *pDest = (float *) (map + y * pt->stride + x*4);
          for (i = 0; i < h; i++) {
             for (j = 0; j < w; j++) {
                /* convert 32-bit integer Z to float Z */