diff --git a/src/mesa/drivers/dri/i965/brw_program.c b/src/mesa/drivers/dri/i965/brw_program.c
index 7a85678f86d..7f0b7133f54 100644
--- a/src/mesa/drivers/dri/i965/brw_program.c
+++ b/src/mesa/drivers/dri/i965/brw_program.c
@@ -838,3 +838,19 @@ brw_assign_common_binding_table_offsets(const struct gen_device_info *devinfo,
    assert(next_binding_table_offset <= BRW_MAX_SURFACES);
    return next_binding_table_offset;
 }
+
+void
+brw_prog_key_set_id(union brw_any_prog_key *key, gl_shader_stage stage,
+                    unsigned id)
+{
+   static const unsigned stage_offsets[] = {
+      offsetof(struct brw_vs_prog_key, program_string_id),
+      offsetof(struct brw_tcs_prog_key, program_string_id),
+      offsetof(struct brw_tes_prog_key, program_string_id),
+      offsetof(struct brw_gs_prog_key, program_string_id),
+      offsetof(struct brw_wm_prog_key, program_string_id),
+      offsetof(struct brw_cs_prog_key, program_string_id),
+   };
+   assert((int)stage >= 0 && stage < ARRAY_SIZE(stage_offsets));
+   *(unsigned*)((uint8_t*)key + stage_offsets[stage]) = id;
+}
diff --git a/src/mesa/drivers/dri/i965/brw_program.h b/src/mesa/drivers/dri/i965/brw_program.h
index a49bc81a2b4..3cdb90264ad 100644
--- a/src/mesa/drivers/dri/i965/brw_program.h
+++ b/src/mesa/drivers/dri/i965/brw_program.h
@@ -82,6 +82,9 @@ brw_assign_common_binding_table_offsets(const struct gen_device_info *devinfo,
                                         const struct gl_program *prog,
                                         struct brw_stage_prog_data *stage_prog_data,
                                         uint32_t next_binding_table_offset);
+void
+brw_prog_key_set_id(union brw_any_prog_key *key, gl_shader_stage stage,
+                    unsigned id);
 
 void
 brw_stage_prog_data_free(const void *prog_data);