diff --git a/fuzz.bash b/fuzz.bash
index 54bdfa6..2b18814 100755
--- a/fuzz.bash
+++ b/fuzz.bash
@@ -25,7 +25,7 @@ function fuzz_kinda() {
    for i in ${indices[@]}; do
       # generate a random string
       str=$(xxd -l "$i" -ps /dev/urandom)
-      printf "$str" | $_input_bin
+      printf "${str:0:$i}" | $_input_bin
    done
 }