diff --git a/entrypoint.sh b/entrypoint.sh
index 54dfdf4..94885a4 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -1,7 +1,7 @@
 #!/bin/sh -ex
 #shellcheck disable=SC1091
 
-cd "./${INPUT_DOCKERFILE%/*}"
+cd "$(dirname "$INPUT_DOCKERFILE")"
 
 [ -f .env ] && . ./.env