diff --git a/include/asterisk/stringfields.h b/include/asterisk/stringfields.h
index 5fe0fc30f3..f842601ca9 100644
--- a/include/asterisk/stringfields.h
+++ b/include/asterisk/stringfields.h
@@ -230,7 +230,7 @@ void __ast_string_field_ptr_build_va(struct ast_string_field_mgr *mgr,
 
 /*! \internal \brief internal version of ast_string_field_init */
 int __ast_string_field_init(struct ast_string_field_mgr *mgr,
-	struct ast_string_field_pool **pool_head, size_t needed);
+	struct ast_string_field_pool **pool_head, int needed);
 
 /*!
   \brief Set a field to a simple string value
diff --git a/main/utils.c b/main/utils.c
index 49e559da94..d94889188d 100644
--- a/main/utils.c
+++ b/main/utils.c
@@ -1244,7 +1244,7 @@ static int add_string_pool(struct ast_string_field_mgr *mgr,
  *	This must be done before destroying the object.
  */
 int __ast_string_field_init(struct ast_string_field_mgr *mgr,
-	struct ast_string_field_pool **pool_head, size_t size)
+	struct ast_string_field_pool **pool_head, int size)
 {
 	const char **p = (const char **)pool_head + 1;
 	struct ast_string_field_pool *cur = *pool_head;