diff --git a/plugins/sudoers/gram.c b/plugins/sudoers/gram.c
index 301cf73ae..aa7117d19 100644
--- a/plugins/sudoers/gram.c
+++ b/plugins/sudoers/gram.c
@@ -762,7 +762,7 @@ new_member(char *name, int type)
     debug_return_ptr(m);
 }
 
-struct sudo_digest *
+static struct sudo_digest *
 new_digest(int digest_type, const char *digest_str)
 {
     struct sudo_digest *dig;
diff --git a/plugins/sudoers/gram.y b/plugins/sudoers/gram.y
index 8e3d95eca..da87b97cc 100644
--- a/plugins/sudoers/gram.y
+++ b/plugins/sudoers/gram.y
@@ -929,7 +929,7 @@ new_member(char *name, int type)
     debug_return_ptr(m);
 }
 
-struct sudo_digest *
+static struct sudo_digest *
 new_digest(int digest_type, const char *digest_str)
 {
     struct sudo_digest *dig;