diff --git a/tools/fbsprite.sh b/tools/fbsprite.sh
index 4d742a74..b31ddc70 100755
--- a/tools/fbsprite.sh
+++ b/tools/fbsprite.sh
@@ -5,4 +5,4 @@
 set -e
 
 gm convert $1'[0]' -trim -resize 150x150 -background white -gravity center -extent 198x198 -bordercolor black -border 1 $2
-advpng -z $2
+advpng -q -z $2
diff --git a/tools/twittersprite.sh b/tools/twittersprite.sh
index ca7f15e5..953d17a5 100755
--- a/tools/twittersprite.sh
+++ b/tools/twittersprite.sh
@@ -5,4 +5,4 @@
 set -e
 
 gm convert $1'[0]' -trim -resize 115x115 -background white -gravity center -extent 120x120 $2
-advpng -z $2
+advpng -q -z $2