diff --git a/etc/teams.scm.in b/etc/teams.scm.in
index 55242caad1..703d76fe8d 100644
--- a/etc/teams.scm.in
+++ b/etc/teams.scm.in
@@ -770,13 +770,16 @@ (define (diff-revisions rev-start rev-end)
     files))
 
 (define (git-patch->commit-id file)
-  "Parse the commit ID from the first line of FILE, a patch produced with git."
+  "Parse the commit ID from FILE, a patch produced with git."
   (call-with-input-file file
     (lambda (port)
-      (let ((m (string-match "^From ([0-9a-f]{40})" (read-line port))))
-        (unless m
-          (error "invalid patch file:" file))
-        (match:substring m 1)))))
+      (let loop ((line (read-line port)))
+        (when (eof-object? line)
+          (error "could not find 'from' commit in patch" file))
+        (let ((m (string-match "^From ([0-9a-f]{40})" line)))
+          (if m
+           (match:substring m 1)
+           (loop (read-line port))))))))
 
 (define (git-patch->revisions file)
   "Return the start and end revisions of FILE, a patch file produced with git."