diff --git a/dlls/dbghelp/symbol.c b/dlls/dbghelp/symbol.c
index 38603cf609..1d7edb8463 100644
--- a/dlls/dbghelp/symbol.c
+++ b/dlls/dbghelp/symbol.c
@@ -617,8 +617,8 @@ static void symt_fill_sym_info(const struct module_pair* pair,
     if (sym_info->MaxNameLen)
     {
         if (sym->tag != SymTagPublicSymbol || !(dbghelp_options & SYMOPT_UNDNAME) ||
-            (sym_info->NameLen = UnDecorateSymbolName(name, sym_info->Name, 
-                                                      sym_info->MaxNameLen, UNDNAME_COMPLETE) == 0))
+            (sym_info->NameLen = UnDecorateSymbolName(name, sym_info->Name,
+                                                      sym_info->MaxNameLen, UNDNAME_NAME_ONLY) == 0))
         {
             sym_info->NameLen = min(strlen(name), sym_info->MaxNameLen - 1);
             memcpy(sym_info->Name, name, sym_info->NameLen);