diff --git a/testcases/checksum_buffersize.sh b/testcases/checksum_buffersize.sh
index de0649a..dfa91df 100755
--- a/testcases/checksum_buffersize.sh
+++ b/testcases/checksum_buffersize.sh
@@ -25,7 +25,7 @@ dbgecho "check so all buffersizes behave the same"
 for checksumtype in sha256; do
   i=1
   while :; do
-    if [ $i -gt 128 ]; then
+    if [ $i -gt 65536 ]; then
       break
     fi
     i="$((i * 2))"