diff --git a/st.c b/st.c
index 2e7fc6bfde..c5a20698af 100644
--- a/st.c
+++ b/st.c
@@ -135,7 +135,7 @@ struct st_table_entry {
 };
 
 #define type_numhash st_hashtype_num
-const struct st_hash_type st_hashtype_num = {
+static const struct st_hash_type st_hashtype_num = {
     st_numcmp,
     st_numhash,
 };