diff --git a/clang/lib/Headers/__clang_cuda_cmath.h b/clang/lib/Headers/__clang_cuda_cmath.h
--- a/clang/lib/Headers/__clang_cuda_cmath.h
+++ b/clang/lib/Headers/__clang_cuda_cmath.h
@@ -191,7 +191,7 @@
       typename __clang_cuda_enable_if<std::numeric_limits<__T>::is_integer,    \
                                       __retty>::type                           \
       __fn(__T __x) {                                                          \
-    return ::__fn((double)__x);                                                \
+    return __fn((double)__x);                                                  \
   }
 
 // Defines an overload of __fn that accepts one two arithmetic arguments, calls