diff --git a/openmp/runtime/src/include/omp.h.var b/openmp/runtime/src/include/omp.h.var
--- a/openmp/runtime/src/include/omp.h.var
+++ b/openmp/runtime/src/include/omp.h.var
@@ -468,6 +468,15 @@
     /* OpenMP 5.1 Display Environment */
     extern void omp_display_env(int verbose);
 
+#   if defined(_OPENMP) && _OPENMP >= 201811
+    #pragma omp begin declare variant match(device={kind(host)})
+    static int omp_is_initial_device(void) { return 1; }
+    #pragma omp end declare variant
+    #pragma omp begin declare variant match(device={kind(nohost)})
+    static int omp_is_initial_device(void) { return 0; }
+    #pragma omp end declare variant
+#   endif
+
 #   undef __KAI_KMPC_CONVENTION
 #   undef __KMP_IMP