diff --git a/CHANGELOG.md b/CHANGELOG.md
index a1bbc5d2..2c1fc2e8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,11 @@
 ArduinoJson: change log
 =======================
 
+HEAD
+----
+
+* Fixed error `'dummy' may be used uninitialized` on GCC 11
+
 v6.18.3 (2021-07-27)
 -------
 
diff --git a/src/ArduinoJson/Variant/ConverterImpl.hpp b/src/ArduinoJson/Variant/ConverterImpl.hpp
index 33f8c650..e3288c8b 100644
--- a/src/ArduinoJson/Variant/ConverterImpl.hpp
+++ b/src/ArduinoJson/Variant/ConverterImpl.hpp
@@ -27,7 +27,7 @@ struct Converter {
   }
 
   static bool checkJson(VariantConstRef src) {
-    T dummy;
+    T dummy = T();
     // clang-format off
     return canConvertFromJson(src, dummy);  // Error here? See https://arduinojson.org/v6/unsupported-is/
     // clang-format on