diff --git a/generate-stackbrew-library.sh b/generate-stackbrew-library.sh
index 1eec0df..c8cdeab 100755
--- a/generate-stackbrew-library.sh
+++ b/generate-stackbrew-library.sh
@@ -3,7 +3,7 @@ set -e
 
 cd "$(dirname "$(readlink -f "$BASH_SOURCE")")"
 url='git://github.com/docker-library/julia'
-commit=$(git log -1 --format="format:%H" -- Dockerfile)
+commit="$(git log -1 --format='format:%H' -- Dockerfile $(awk 'toupper($1) == "COPY" { for (i = 2; i < NF; i++) { print $i } }' Dockerfile))"
 fullVersion="$(grep -m1 'ENV JULIA_VERSION' Dockerfile | cut -d' ' -f3)"
 version="${fullVersion%[.-]*}"