diff --git a/clang/lib/Sema/SemaDeclAttr.cpp b/clang/lib/Sema/SemaDeclAttr.cpp
index 620290af9509f..a13c04d69c4ba 100644
--- a/clang/lib/Sema/SemaDeclAttr.cpp
+++ b/clang/lib/Sema/SemaDeclAttr.cpp
@@ -4700,7 +4700,8 @@ void Sema::AddModeAttr(Decl *D, const AttributeCommonInfo &CI,
 
   if (NewElemTy.isNull()) {
     // Only emit diagnostic on host for 128-bit mode attribute
-    if (!(DestWidth == 128 && getLangOpts().CUDAIsDevice))
+    if (!(DestWidth == 128 &&
+          (getLangOpts().CUDAIsDevice || getLangOpts().SYCLIsDevice)))
       Diag(AttrLoc, diag::err_machine_mode) << 1 /*Unsupported*/ << Name;
     return;
   }
diff --git a/clang/test/SemaSYCL/float128.cpp b/clang/test/SemaSYCL/float128.cpp
index b1a022216aaff..e41dea38dbe75 100644
--- a/clang/test/SemaSYCL/float128.cpp
+++ b/clang/test/SemaSYCL/float128.cpp
@@ -1,6 +1,7 @@
 // RUN: %clang_cc1 -triple spir64 -fsycl-is-device -verify -fsyntax-only %s
 // RUN: %clang_cc1 -triple x86_64-linux-gnu -fsycl-is-device -fsyntax-only %s
 
+typedef _Complex float __cfloat128 __attribute__ ((__mode__ (__TC__)));
 typedef __float128 BIGTY;
 
 template <class T>