diff --git a/dmd/mangle.c b/dmd/mangle.c
index af8294ed..54186f57 100644
--- a/dmd/mangle.c
+++ b/dmd/mangle.c
@@ -225,11 +225,12 @@ char *TemplateInstance::mangle()
     printf("\n");
 #endif
     id = ident ? ident->toChars() : toChars();
+    Dsymbol *par = isnested || isTemplateMixin() ? parent : tempdecl->parent;
     if (!tempdecl)
         error("is not defined");
-    else if (tempdecl->parent)
+    else if (par)
     {
-        char *p = tempdecl->parent->mangle();
+        char *p = par->mangle();
         if (p[0] == '_' && p[1] == 'D')
             p += 2;
         buf.writestring(p);