diff --git a/clang/lib/Headers/openmp_wrappers/complex b/clang/lib/Headers/openmp_wrappers/complex
--- a/clang/lib/Headers/openmp_wrappers/complex
+++ b/clang/lib/Headers/openmp_wrappers/complex
@@ -17,7 +17,6 @@
 // We require std::math functions in the complex builtins below.
 #include <cmath>
 
-#define __CUDA__
 #define __OPENMP_NVPTX__
 #include <__clang_cuda_complex_builtins.h>
 #undef __OPENMP_NVPTX__
@@ -26,9 +25,6 @@
 // Grab the host header too.
 #include_next <complex>
 
-
-#ifdef __cplusplus
-
 // If we are compiling against libc++, the macro _LIBCPP_STD_VER should be set
 // after including <cmath> above. Since the complex header we use is a
 // simplified version of the libc++, we don't need it in this case. If we
@@ -48,5 +44,3 @@
 #pragma omp end declare variant
 
 #endif
-
-#endif
diff --git a/clang/lib/Headers/openmp_wrappers/complex.h b/clang/lib/Headers/openmp_wrappers/complex.h
--- a/clang/lib/Headers/openmp_wrappers/complex.h
+++ b/clang/lib/Headers/openmp_wrappers/complex.h
@@ -17,7 +17,6 @@
 // We require math functions in the complex builtins below.
 #include <math.h>
 
-#define __CUDA__
 #define __OPENMP_NVPTX__
 #include <__clang_cuda_complex_builtins.h>
 #undef __OPENMP_NVPTX__