diff --git a/notmuch-private.h b/notmuch-private.h
index 42f8d275..c80f219a 100644
--- a/notmuch-private.h
+++ b/notmuch-private.h
@@ -160,9 +160,6 @@ _notmuch_thread_add_tag (notmuch_thread_t *thread, const char *tag);
 void
 _notmuch_thread_set_subject (notmuch_thread_t *thread, const char *subject);
 
-const char *
-_notmuch_thread_get_subject (notmuch_thread_t *thread);
-
 /* message.cc */
 
 notmuch_message_t *
diff --git a/notmuch.c b/notmuch.c
index ae1d5976..c432d0d7 100644
--- a/notmuch.c
+++ b/notmuch.c
@@ -653,7 +653,7 @@ search_command (int argc, char *argv[])
 
 	printf ("%s %s",
 		notmuch_thread_get_thread_id (thread),
-		_notmuch_thread_get_subject (thread));
+		notmuch_thread_get_subject (thread));
 
 	printf (" (");
 	for (tags = notmuch_thread_get_tags (thread);
diff --git a/thread.cc b/thread.cc
index 9b49c550..e4c9e111 100644
--- a/thread.cc
+++ b/thread.cc
@@ -96,7 +96,7 @@ _notmuch_thread_set_subject (notmuch_thread_t *thread, const char *subject)
 }
 
 const char *
-_notmuch_thread_get_subject (notmuch_thread_t *thread)
+notmuch_thread_get_subject (notmuch_thread_t *thread)
 {
     return thread->subject;
 }