diff --git a/compile.c b/compile.c
index d709db0..b602508 100644
--- a/compile.c
+++ b/compile.c
@@ -182,7 +182,7 @@ CORD compile_statement(env_t *env, ast_t *ast)
         (void)result_t;
         for (when_clause_t *clause = when->clauses; clause; clause = clause->next) {
             const char *clause_tag_name = Match(clause->tag_name, Var)->name;
-            code = CORD_all(code, "case ", env->file_prefix, enum_t->name, "$tag$", clause_tag_name, ": {\n");
+            code = CORD_all(code, "case ", enum_t->env->file_prefix, enum_t->name, "$tag$", clause_tag_name, ": {\n");
             type_t *tag_type = NULL;
             for (tag_t *tag = enum_t->tags; tag; tag = tag->next) {
                 if (streq(tag->name, clause_tag_name)) {