diff --git a/src/gallium/drivers/r300/r300_context.c b/src/gallium/drivers/r300/r300_context.c
index 76c2e232009..048f810b6b4 100644
--- a/src/gallium/drivers/r300/r300_context.c
+++ b/src/gallium/drivers/r300/r300_context.c
@@ -199,9 +199,9 @@ static boolean r300_setup_atoms(struct r300_context* r300)
     R300_INIT_ATOM(texture_cache_inval, 2);
     R300_INIT_ATOM(textures_state, 0);
     /* HiZ Clear */
-    R300_INIT_ATOM(hiz_clear, r300->screen->caps.hiz_ram > 0 ? 4 : 0);
+    R300_INIT_ATOM(hiz_clear, r300->screen->caps.hiz_ram > 0 ? 6 : 0);
     /* zmask clear */
-    R300_INIT_ATOM(zmask_clear, r300->screen->caps.zmask_ram > 0 ? 4 : 0);
+    R300_INIT_ATOM(zmask_clear, r300->screen->caps.zmask_ram > 0 ? 6 : 0);
     /* ZB (unpipelined), SU. */
     R300_INIT_ATOM(query_start, 4);
 
diff --git a/src/gallium/drivers/r300/r300_emit.c b/src/gallium/drivers/r300/r300_emit.c
index 8d9d3386239..6ddb5066bb8 100644
--- a/src/gallium/drivers/r300/r300_emit.c
+++ b/src/gallium/drivers/r300/r300_emit.c
@@ -1105,6 +1105,9 @@ void r300_emit_hiz_clear(struct r300_context *r300, unsigned size, void *state)
     tex = r300_resource(fb->zsbuf->texture);
 
     BEGIN_CS(size);
+    OUT_CS_REG(R300_ZB_ZCACHE_CTLSTAT,
+        R300_ZB_ZCACHE_CTLSTAT_ZC_FLUSH_FLUSH_AND_FREE |
+        R300_ZB_ZCACHE_CTLSTAT_ZC_FREE_FREE);
     OUT_CS_PKT3(R300_PACKET3_3D_CLEAR_HIZ, 2);
     OUT_CS(0);
     OUT_CS(tex->tex.hiz_dwords[fb->zsbuf->u.tex.level]);
@@ -1127,6 +1130,9 @@ void r300_emit_zmask_clear(struct r300_context *r300, unsigned size, void *state
     tex = r300_resource(fb->zsbuf->texture);
 
     BEGIN_CS(size);
+    OUT_CS_REG(R300_ZB_ZCACHE_CTLSTAT,
+        R300_ZB_ZCACHE_CTLSTAT_ZC_FLUSH_FLUSH_AND_FREE |
+        R300_ZB_ZCACHE_CTLSTAT_ZC_FREE_FREE);
     OUT_CS_PKT3(R300_PACKET3_3D_CLEAR_ZMASK, 2);
     OUT_CS(0);
     OUT_CS(tex->tex.zmask_dwords[fb->zsbuf->u.tex.level]);