diff --git a/src/gallium/frontends/nine/nine_ff.h b/src/gallium/frontends/nine/nine_ff.h
index 4e9dc189f48..8d299f2a821 100644
--- a/src/gallium/frontends/nine/nine_ff.h
+++ b/src/gallium/frontends/nine/nine_ff.h
@@ -88,20 +88,21 @@ nine_ff_get_projected_key(struct nine_context *context, unsigned num_stages)
     for (s = 0; s < num_stages; ++s) {
         unsigned gen = (context->ff.tex_stage[s][D3DTSS_TEXCOORDINDEX] >> 16) + 1;
         unsigned dim = context->ff.tex_stage[s][D3DTSS_TEXTURETRANSFORMFLAGS] & 0x7;
+        unsigned idx = context->ff.tex_stage[s][D3DTSS_TEXCOORDINDEX] & 7;
         unsigned proj = !!(context->ff.tex_stage[s][D3DTSS_TEXTURETRANSFORMFLAGS] & D3DTTFF_PROJECTED);
 
         if (!context->vs) {
             if (dim > 4)
-                dim = input_texture_coord[s];
+                dim = input_texture_coord[idx];
 
             if (!dim && gen == NINED3DTSS_TCI_PASSTHRU)
-                dim = input_texture_coord[s];
+                dim = input_texture_coord[idx];
             else if (!dim)
                 dim = 4;
 
             if (dim == 1) /* NV behaviour */
                 proj = 0;
-            if (dim > input_texture_coord[s] && gen == NINED3DTSS_TCI_PASSTHRU)
+            if (dim > input_texture_coord[idx] && gen == NINED3DTSS_TCI_PASSTHRU)
                 proj = 0;
         } else {
             dim = 4;