diff --git a/include/nlohmann/detail/macro_scope.hpp b/include/nlohmann/detail/macro_scope.hpp
index 400530a60..76a0dc62c 100644
--- a/include/nlohmann/detail/macro_scope.hpp
+++ b/include/nlohmann/detail/macro_scope.hpp
@@ -301,3 +301,7 @@
 #else
     #define JSON_EXPLICIT explicit
 #endif
+
+#ifndef JSON_DIAGNOSTICS
+    #define JSON_DIAGNOSTICS 0
+#endif
diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index 5ba4a4bed..fd97d9c28 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -2514,6 +2514,10 @@ JSON_HEDLEY_DIAGNOSTIC_POP
     #define JSON_EXPLICIT explicit
 #endif
 
+#ifndef JSON_DIAGNOSTICS
+    #define JSON_DIAGNOSTICS 0
+#endif
+
 
 namespace nlohmann
 {