diff --git a/prism/prism.c b/prism/prism.c
index 99aa7982a3..00485b68ad 100644
--- a/prism/prism.c
+++ b/prism/prism.c
@@ -961,20 +961,18 @@ pm_locals_order(PRISM_ATTRIBUTE_UNUSED pm_parser_t *parser, pm_locals_t *locals,
         if (local->name != PM_CONSTANT_ID_UNSET) {
             pm_constant_id_list_insert(list, (size_t) local->index, local->name);
 
-            if (warn_unused && local->reads == 0) {
-                if (pm_newline_list_line(&parser->newline_list, local->location.start, parser->start_line) >= 0) {
-                    pm_constant_t *constant = pm_constant_pool_id_to_constant(&parser->constant_pool, local->name);
+            if (warn_unused && local->reads == 0 && ((parser->start_line >= 0) || (pm_newline_list_line(&parser->newline_list, local->location.start, parser->start_line) >= 0))) {
+                pm_constant_t *constant = pm_constant_pool_id_to_constant(&parser->constant_pool, local->name);
 
-                    if (constant->length >= 1 && *constant->start != '_') {
-                        PM_PARSER_WARN_FORMAT(
-                            parser,
-                            local->location.start,
-                            local->location.end,
-                            PM_WARN_UNUSED_LOCAL_VARIABLE,
-                            (int) constant->length,
-                            (const char *) constant->start
-                        );
-                    }
+                if (constant->length >= 1 && *constant->start != '_') {
+                    PM_PARSER_WARN_FORMAT(
+                        parser,
+                        local->location.start,
+                        local->location.end,
+                        PM_WARN_UNUSED_LOCAL_VARIABLE,
+                        (int) constant->length,
+                        (const char *) constant->start
+                    );
                 }
             }
         }