diff --git a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
index aaf932fa02d..544974a9fdd 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
@@ -2824,6 +2824,7 @@ vec4_visitor::vec4_visitor(struct brw_context *brw,
 
    this->base_ir = NULL;
    this->current_annotation = NULL;
+   memset(this->output_reg_annotation, 0, sizeof(this->output_reg_annotation));
 
    this->c = c;
    this->vp = &c->vp->program;