diff --git a/shared/build-lib.sh b/shared/build-lib.sh
index 1440950..962b2d6 100755
--- a/shared/build-lib.sh
+++ b/shared/build-lib.sh
@@ -176,7 +176,10 @@ _source_commit_ref() {
 _source_commit_slug() {
     _ref=$(_source_commit_ref)
     _full_sha=$(git -C "$root_dir" rev-parse "$_ref" 2>/dev/null || echo "0000000000000000")
-    _words_file="$root_dir/shared/build-words.txt"
+    # build-lib.sh is sourced from each tool's build.sh as
+    # "$root_dir/../shared/build-lib.sh"; the wordlist lives next to
+    # this file in the same shared/ directory.
+    _words_file="$root_dir/../shared/build-words.txt"
     if [ ! -f "$_words_file" ]; then
         # Fall back to plain short SHA if the wordlist is missing
         # (e.g. running from a checkout that predates this feature).