diff --git a/test/test-functions b/test/test-functions
index cd8175117b..e6fccce8c3 100644
--- a/test/test-functions
+++ b/test/test-functions
@@ -470,7 +470,7 @@ create_empty_image() {
     [ -b "$LOOPDEV" ] || return 1
     echo "LOOPDEV=$LOOPDEV" >> $STATEFILE
     sfdisk "$LOOPDEV" <<EOF
-,$((_size-10))M
+,$((_size-50))M
 ,
 EOF