diff --git a/create_test_file.sh b/create_test_file.sh
index a2fb357..381917e 100755
--- a/create_test_file.sh
+++ b/create_test_file.sh
@@ -1,4 +1,7 @@
 #!/bin/bash
 
-head -c 10M /dev/urandom > test_data/$(cat /dev/urandom | LC_ALL=C tr -dc 'a-zA-Z0-9' | fold -w 20 | head -n 1
+mkdir -p ./test_data/
+
+head -c 10M /dev/urandom >test_data/$(
+  cat /dev/urandom | LC_ALL=C tr -dc 'a-zA-Z0-9' | fold -w 20 | head -n 1
 ).bin