diff --git a/.github/actions/compile_inchi_lib/action.yaml b/.github/actions/compile_inchi_lib/action.yaml
index 1cf8b31..499fd79 100644
--- a/.github/actions/compile_inchi_lib/action.yaml
+++ b/.github/actions/compile_inchi_lib/action.yaml
@@ -1,4 +1,4 @@
-name: Compile InChI library from triggering branch
+name: Compile InChI library from triggering commit
 
 runs:
   using: "composite"
@@ -6,12 +6,10 @@ runs:
     - run: |
         git config --global --add safe.directory "$GITHUB_WORKSPACE" # https://github.com/actions/runner-images/issues/6775
         mkdir "$GITHUB_WORKSPACE/$LIB_DIR"
-        ./INCHI-1-TEST/compile_inchi_lib.sh $BRANCH "$GITHUB_WORKSPACE/$LIB_DIR"
-        if [ "$BRANCH" != "main" ]; then
-          # Rename library to libinchi.so.main, since that's the name the tests expect.
-          mv "$GITHUB_WORKSPACE/$LIB_DIR/libinchi.so.$BRANCH" "$GITHUB_WORKSPACE/$LIB_DIR/libinchi.so.main"
-        fi
+        ./INCHI-1-TEST/compile_inchi_lib.sh $COMMIT "$GITHUB_WORKSPACE/$LIB_DIR"
+        # Rename library to libinchi.so.main, since that's the name the tests expect.
+        mv "$GITHUB_WORKSPACE/$LIB_DIR/libinchi.so.$COMMIT" "$GITHUB_WORKSPACE/$LIB_DIR/libinchi.so.main"
       shell: bash
       env:
-        BRANCH: ${{ github.ref_name }}
+        COMMIT: ${{ github.sha }}
         LIB_DIR: INCHI-1-TEST/libs
diff --git a/INCHI-1-TEST/compile_inchi_lib.sh b/INCHI-1-TEST/compile_inchi_lib.sh
index 2944a93..e9db1ba 100755
--- a/INCHI-1-TEST/compile_inchi_lib.sh
+++ b/INCHI-1-TEST/compile_inchi_lib.sh
@@ -2,7 +2,7 @@
 
 set -e
 
-inchi_version=$1 # Must be one of the tags in `git tag` or branches in `git branch`.
+inchi_version=$1 # Must be one of the tags in `git tag`, branches in `git branch`, or a commit hash.
 inchi_lib_dir=$2 # Path must be absolute.
 current_branch=$(git rev-parse --abbrev-ref HEAD)
 makefile_dir="INCHI-1-SRC/INCHI_API/libinchi/gcc"
@@ -24,7 +24,6 @@ if [ -n "$(git status --porcelain)" ]; then
     exit 1
 fi
 
-# Check out the specified tag or branch.
 if git rev-parse --verify --quiet refs/tags/$inchi_version; then
     echo "Checking out version tag '$inchi_version'."
     git checkout "tags/$inchi_version"
@@ -32,13 +31,13 @@ if git rev-parse --verify --quiet refs/tags/$inchi_version; then
 fi
 
 if git rev-parse --verify --quiet $inchi_version; then
-    echo "Checking out branch '$inchi_version'."
+    echo "Checking out branch or commit '$inchi_version'."
     git checkout $inchi_version
     checkout_successful=1
 fi
 
 if [ $checkout_successful -eq 0 ]; then
-    echo "Version tag or branch '$inchi_version' does not exist."
+    echo "'$inchi_version' does not exist."
     exit 1
 fi