diff --git a/bin/git-check-assertions b/bin/git-check-assertions
index 1195884..5cc842f 100755
--- a/bin/git-check-assertions
+++ b/bin/git-check-assertions
@@ -118,7 +118,10 @@ for commit_hash in "${commits[@]}"; do
     block_num=$((block_num + 1))
     echo "git-check-assertions block $block_num:"
     printf '%s' "$block" | sed 's/^/> /'
-    if ! bash -euo pipefail -c "$block"; then
+    check_assertions() {
+      bash -euo pipefail -c "$block"
+    }
+    if ! check_assertions; then
       echo "git-check-assertions block failed in $commit_hash" >&2
       restore
       echo "Returning to $orig_ref"