diff --git a/src/mesa/drivers/dri/r300/r300_vertexprog.c b/src/mesa/drivers/dri/r300/r300_vertexprog.c
index 2ff92e1..5141441 100644
--- a/src/mesa/drivers/dri/r300/r300_vertexprog.c
+++ b/src/mesa/drivers/dri/r300/r300_vertexprog.c
@@ -1092,25 +1092,30 @@ static struct r300_vertex_program *build_program(struct r300_vertex_program_key
 						 GLint wpos_idx)
 {
 	struct r300_vertex_program *vp;
-
+	struct gl_program tempBase = mesa_vp->Base;
+	
+	tempBase.Instructions = _mesa_calloc(mesa_vp->Base.NumInstructions*sizeof(struct prog_instruction));
+	
+	_mesa_memcpy(tempBase.Instructions, mesa_vp->Base.Instructions, mesa_vp->Base.NumInstructions*sizeof(struct prog_instruction));
+	
 	vp = _mesa_calloc(sizeof(*vp));
 	_mesa_memcpy(&vp->key, wanted_key, sizeof(vp->key));
 
 	vp->wpos_idx = wpos_idx;
 
 	if(mesa_vp->IsPositionInvariant) {
-		position_invariant(&mesa_vp->Base);
+		position_invariant(&tempBase);
 	}
 
 	if(wpos_idx > -1)
-		pos_as_texcoord(vp, &mesa_vp->Base);
+		pos_as_texcoord(vp, &tempBase);
 
-	assert(mesa_vp->Base.NumInstructions);
+	assert(tempBase.NumInstructions);
 
 	vp->num_temporaries=mesa_vp->Base.NumTemporaries;
 
-	r300_translate_vertex_shader(vp, mesa_vp->Base.Instructions);
-
+	r300_translate_vertex_shader(vp, tempBase.Instructions);
+	_mesa_free(tempBase.Instructions);
 	return vp;	
 }