diff --git a/prism/prism.c b/prism/prism.c
index e02bceed65..4f65e1e017 100644
--- a/prism/prism.c
+++ b/prism/prism.c
@@ -4411,6 +4411,12 @@ pm_interpolated_symbol_node_append(pm_interpolated_symbol_node_t *node, pm_node_
     node->base.location.end = MAX(node->base.location.end, part->location.end);
 }
 
+static void
+pm_interpolated_symbol_node_closing_loc_set(pm_interpolated_symbol_node_t *node, const pm_token_t *closing) {
+    node->closing_loc = PM_OPTIONAL_LOCATION_TOKEN_VALUE(closing);
+    node->base.location.end = closing->end;
+}
+
 /**
  * Allocate and initialize a new InterpolatedSymbolNode node.
  */
@@ -14151,14 +14157,12 @@ parse_symbol(pm_parser_t *parser, pm_lex_mode_t *lex_mode, pm_lex_state_t next_s
             return (pm_node_t *) pm_string_node_to_symbol_node(parser, (pm_string_node_t *) part, &opening, &parser->previous);
         }
 
-        // Create a node_list first. We'll use this to check if it should be an
-        // InterpolatedSymbolNode or a SymbolNode.
-        pm_node_list_t node_list = { 0 };
-        if (part) pm_node_list_append(&node_list, part);
+        pm_interpolated_symbol_node_t *symbol = pm_interpolated_symbol_node_create(parser, &opening, NULL, &opening);
+        if (part) pm_interpolated_symbol_node_append(symbol, part);
 
         while (!match2(parser, PM_TOKEN_STRING_END, PM_TOKEN_EOF)) {
             if ((part = parse_string_part(parser)) != NULL) {
-                pm_node_list_append(&node_list, part);
+                pm_interpolated_symbol_node_append(symbol, part);
             }
         }
 
@@ -14169,7 +14173,8 @@ parse_symbol(pm_parser_t *parser, pm_lex_mode_t *lex_mode, pm_lex_state_t next_s
             expect1(parser, PM_TOKEN_STRING_END, PM_ERR_SYMBOL_TERM_INTERPOLATED);
         }
 
-        return (pm_node_t *) pm_interpolated_symbol_node_create(parser, &opening, &node_list, &parser->previous);
+        pm_interpolated_symbol_node_closing_loc_set(symbol, &parser->previous);
+        return (pm_node_t *) symbol;
     }
 
     pm_token_t content;
@@ -14190,14 +14195,14 @@ parse_symbol(pm_parser_t *parser, pm_lex_mode_t *lex_mode, pm_lex_state_t next_s
         // In this case, the best way we have to represent this is as an
         // interpolated string node, so that's what we'll do here.
         if (match1(parser, PM_TOKEN_STRING_CONTENT)) {
-            pm_node_list_t parts = { 0 };
+            pm_interpolated_symbol_node_t *symbol = pm_interpolated_symbol_node_create(parser, &opening, NULL, &opening);
             pm_token_t bounds = not_provided(parser);
 
             pm_node_t *part = (pm_node_t *) pm_string_node_create_unescaped(parser, &bounds, &content, &bounds, &unescaped);
-            pm_node_list_append(&parts, part);
+            pm_interpolated_symbol_node_append(symbol, part);
 
             part = (pm_node_t *) pm_string_node_create_unescaped(parser, &bounds, &parser->current, &bounds, &parser->current_string);
-            pm_node_list_append(&parts, part);
+            pm_interpolated_symbol_node_append(symbol, part);
 
             if (next_state != PM_LEX_STATE_NONE) {
                 lex_state_set(parser, next_state);
@@ -14205,7 +14210,9 @@ parse_symbol(pm_parser_t *parser, pm_lex_mode_t *lex_mode, pm_lex_state_t next_s
 
             parser_lex(parser);
             expect1(parser, PM_TOKEN_STRING_END, PM_ERR_SYMBOL_TERM_DYNAMIC);
-            return (pm_node_t *) pm_interpolated_symbol_node_create(parser, &opening, &parts, &parser->previous);
+
+            pm_interpolated_symbol_node_closing_loc_set(symbol, &parser->previous);
+            return (pm_node_t *) symbol;
         }
     } else {
         content = (pm_token_t) { .type = PM_TOKEN_STRING_CONTENT, .start = parser->previous.end, .end = parser->previous.end };
@@ -15373,6 +15380,8 @@ parse_strings(pm_parser_t *parser, pm_node_t *current) {
 
                 expect1(parser, PM_TOKEN_STRING_END, PM_ERR_STRING_LITERAL_EOF);
                 node = (pm_node_t *) pm_interpolated_string_node_create(parser, &opening, &parts, &parser->previous);
+
+                pm_node_list_free(&parts);
             } else if (accept1(parser, PM_TOKEN_LABEL_END) && !state_is_arg_labeled) {
                 node = (pm_node_t *) pm_symbol_node_create_unescaped(parser, &opening, &content, &parser->previous, &unescaped, parse_symbol_encoding(parser, &unescaped));
             } else if (match1(parser, PM_TOKEN_EOF)) {
@@ -15427,6 +15436,8 @@ parse_strings(pm_parser_t *parser, pm_node_t *current) {
                     expect1(parser, PM_TOKEN_STRING_END, PM_ERR_STRING_INTERPOLATED_TERM);
                     node = (pm_node_t *) pm_interpolated_string_node_create(parser, &opening, &parts, &parser->previous);
                 }
+
+                pm_node_list_free(&parts);
             }
         } else {
             // If we get here, then the first part of the string is not plain
@@ -15450,6 +15461,8 @@ parse_strings(pm_parser_t *parser, pm_node_t *current) {
                 expect1(parser, PM_TOKEN_STRING_END, PM_ERR_STRING_INTERPOLATED_TERM);
                 node = (pm_node_t *) pm_interpolated_string_node_create(parser, &opening, &parts, &parser->previous);
             }
+
+            pm_node_list_free(&parts);
         }
 
         if (current == NULL) {
@@ -16058,6 +16071,7 @@ parse_expression_prefix(pm_parser_t *parser, pm_binding_power_t binding_power, b
                     node = (pm_node_t *) cast;
                 } else {
                     pm_interpolated_string_node_t *cast = pm_interpolated_string_node_create(parser, &opening, &parts, &opening);
+                    pm_node_list_free(&parts);
 
                     lex_mode_pop(parser);
                     expect1(parser, PM_TOKEN_HEREDOC_END, PM_ERR_HEREDOC_TERM);