diff --git a/clang/lib/Sema/OpenCLBuiltins.td b/clang/lib/Sema/OpenCLBuiltins.td
index 05dd6a1bd8f84f..d6d77dc90d3028 100644
--- a/clang/lib/Sema/OpenCLBuiltins.td
+++ b/clang/lib/Sema/OpenCLBuiltins.td
@@ -1043,6 +1043,7 @@ let Extension = FuncExtKhrInt64ExtendedAtomics in {
 }
 // OpenCL v1.1 s6.11.1, v1.2 s6.12.11 - Atomic Functions
 foreach AS = [GlobalAS, LocalAS] in {
+  def : Builtin<"atomic_xchg", [Float, PointerType<VolatileType<Float>, AS>, Float]>;
   foreach Type = [Int, UInt] in {
     foreach name = ["atomic_add", "atomic_sub", "atomic_xchg",
                     "atomic_min", "atomic_max", "atomic_and",