diff --git a/Dockerfile b/Dockerfile
index de93fcd7..fb5021d0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -15,5 +15,6 @@ FROM alpine as tool
 
 COPY --from=base /src/target/release/oxipng /usr/local/bin
 
+WORKDIR /src
 ENTRYPOINT [ "oxipng" ]
 CMD [ "--help" ]