diff --git a/prism/config.yml b/prism/config.yml
index 9268effce7..1325fc7990 100644
--- a/prism/config.yml
+++ b/prism/config.yml
@@ -215,6 +215,7 @@ errors:
   - PATTERN_EXPRESSION_AFTER_REST
   - PATTERN_HASH_KEY
   - PATTERN_HASH_KEY_DUPLICATE
+  - PATTERN_HASH_KEY_INTERPOLATED
   - PATTERN_HASH_KEY_LABEL
   - PATTERN_HASH_KEY_LOCALS
   - PATTERN_IDENT_AFTER_HROCKET
diff --git a/prism/prism.c b/prism/prism.c
index f5aa51ea01..7d863aadaf 100644
--- a/prism/prism.c
+++ b/prism/prism.c
@@ -16240,7 +16240,8 @@ parse_pattern_hash(pm_parser_t *parser, pm_constant_id_list_t *captures, pm_node
             // If we get anything else, then this is an error. For this we'll
             // create a missing node for the value and create an assoc node for
             // the first node in the list.
-            pm_parser_err_node(parser, first_node, PM_ERR_PATTERN_HASH_KEY_LABEL);
+            pm_diagnostic_id_t diag_id = PM_NODE_TYPE_P(first_node, PM_INTERPOLATED_SYMBOL_NODE) ? PM_ERR_PATTERN_HASH_KEY_INTERPOLATED : PM_ERR_PATTERN_HASH_KEY_LABEL;
+            pm_parser_err_node(parser, first_node, diag_id);
 
             pm_token_t operator = not_provided(parser);
             pm_node_t *value = (pm_node_t *) pm_missing_node_create(parser, first_node->location.start, first_node->location.end);
diff --git a/prism/templates/src/diagnostic.c.erb b/prism/templates/src/diagnostic.c.erb
index ba17cf8306..fcebdc5c38 100644
--- a/prism/templates/src/diagnostic.c.erb
+++ b/prism/templates/src/diagnostic.c.erb
@@ -298,7 +298,8 @@ static const pm_diagnostic_data_t diagnostic_messages[PM_DIAGNOSTIC_ID_MAX] = {
     [PM_ERR_PATTERN_EXPRESSION_AFTER_REST]      = { "unexpected pattern expression after the `**` expression", PM_ERROR_LEVEL_SYNTAX },
     [PM_ERR_PATTERN_HASH_KEY]                   = { "expected a key in the hash pattern", PM_ERROR_LEVEL_SYNTAX },
     [PM_ERR_PATTERN_HASH_KEY_DUPLICATE]         = { "duplicated key name", PM_ERROR_LEVEL_SYNTAX },
-    [PM_ERR_PATTERN_HASH_KEY_LABEL]             = { "expected a label as the key in the hash pattern", PM_ERROR_LEVEL_SYNTAX }, // TODO // THIS // AND // ABOVE // IS WEIRD
+    [PM_ERR_PATTERN_HASH_KEY_INTERPOLATED]      = { "symbol literal with interpolation is not allowed", PM_ERROR_LEVEL_SYNTAX },
+    [PM_ERR_PATTERN_HASH_KEY_LABEL]             = { "expected a label as the key in the hash pattern", PM_ERROR_LEVEL_SYNTAX },
     [PM_ERR_PATTERN_HASH_KEY_LOCALS]            = { "key must be valid as local variables", PM_ERROR_LEVEL_SYNTAX },
     [PM_ERR_PATTERN_IDENT_AFTER_HROCKET]        = { "expected an identifier after the `=>` operator", PM_ERROR_LEVEL_SYNTAX },
     [PM_ERR_PATTERN_LABEL_AFTER_COMMA]          = { "expected a label after the `,` in the hash pattern", PM_ERROR_LEVEL_SYNTAX },