diff --git a/include/git2/stash.h b/include/git2/stash.h
index b321dc34e..733d75a7f 100644
--- a/include/git2/stash.h
+++ b/include/git2/stash.h
@@ -150,7 +150,7 @@ typedef struct git_stash_apply_options {
  *        `GIT_STASH_APPLY_OPTIONS_INIT` here.
  * @return Zero on success; -1 on failure.
  */
-int git_stash_apply_init_options(
+GIT_EXTERN(int) git_stash_apply_init_options(
 	git_stash_apply_options *opts, unsigned int version);
 
 /**