diff --git a/Sandboxie/core/dll/custom.c b/Sandboxie/core/dll/custom.c
index 45a0c550..697be13d 100644
--- a/Sandboxie/core/dll/custom.c
+++ b/Sandboxie/core/dll/custom.c
@@ -1630,7 +1630,7 @@ wchar_t* GuidToString(const GUID guid)
 {
 	wchar_t* buf = Dll_Alloc(64);
 	Sbie_snwprintf(buf, sizeof(buf),
-		L"{%08X-%04X-%04X-%02X%02X-%02X%02X%02X%02X%02X%02X}",
+		L"%08X-%04X-%04X-%02X%02X-%02X%02X%02X%02X%02X%02X",
 		guid.Data1, guid.Data2, guid.Data3,
 		guid.Data4[0], guid.Data4[1], guid.Data4[2], guid.Data4[3],
 		guid.Data4[4], guid.Data4[5], guid.Data4[6], guid.Data4[7]);