diff --git a/ChangeLog b/ChangeLog
index 12e39210f..ca93ef3a1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2005-12-30  Eric Anholt  <anholt@FreeBSD.org>
+
+	* hw/xgl/xglsync.c: (xglSyncBits), (xglSyncSurface):
+	Initialize the fourcc value in stack-allocated glitz_pixel_format_t
+	structures.  Greatly reduces the number of uninitialized-value accesses
+	during Xgl startup according to valgrind.  Allocating and filling these
+	in by hand on the stack seems very shady to me.
+
 2005-12-30  Eric Anholt  <anholt@FreeBSD.org>
 
 	* configure.ac:
diff --git a/hw/xgl/xglsync.c b/hw/xgl/xglsync.c
index 0fa3aa05a..d15733c6b 100644
--- a/hw/xgl/xglsync.c
+++ b/hw/xgl/xglsync.c
@@ -173,6 +173,7 @@ xglSyncBits (DrawablePtr pDrawable,
 	pBox = REGION_RECTS (&region);
 	nBox = REGION_NUM_RECTS (&region);
 
+	format.fourcc = GLITZ_FOURCC_RGB;
 	format.masks = pPixmapPriv->pPixel->masks;
 	
 	while (nBox--)
@@ -250,6 +251,7 @@ xglSyncSurface (DrawablePtr pDrawable)
 	pBox = REGION_RECTS (pRegion);
 	pExt = REGION_EXTENTS (pDrawable->pScreen, pRegion);
 
+	format.fourcc  = GLITZ_FOURCC_RGB;
 	format.masks   = pPixmapPriv->pPixel->masks;
 	format.xoffset = pExt->x1;