diff --git a/src/ArduinoJson/Variant/VariantImpl.hpp b/src/ArduinoJson/Variant/VariantImpl.hpp
index b5a62087..48c45fb8 100644
--- a/src/ArduinoJson/Variant/VariantImpl.hpp
+++ b/src/ArduinoJson/Variant/VariantImpl.hpp
@@ -168,7 +168,7 @@ inline VariantConstRef operator|(VariantConstRef preferedValue,
 
 // Out of class definition to avoid #1560
 inline bool VariantRef::set(char value) const {
-  return set<signed char>(value);
+  return set(static_cast<signed char>(value));
 }
 
 // TODO: move somewhere else
diff --git a/src/ArduinoJson/Variant/VariantRef.hpp b/src/ArduinoJson/Variant/VariantRef.hpp
index 0865d693..31fd0219 100644
--- a/src/ArduinoJson/Variant/VariantRef.hpp
+++ b/src/ArduinoJson/Variant/VariantRef.hpp
@@ -119,7 +119,7 @@ class VariantRef : public VariantRefBase<VariantData>,
   ARDUINOJSON_DEPRECATED(
       "Support for char is deprecated, use int8_t or uint8_t instead")
       as() const {
-    return as<signed char>();
+    return static_cast<char>(as<signed char>());
   }
 
   template <typename T>
@@ -265,7 +265,7 @@ class VariantConstRef : public VariantRefBase<const VariantData>,
   ARDUINOJSON_DEPRECATED(
       "Support for char is deprecated, use int8_t or uint8_t instead")
       as() const {
-    return as<signed char>();
+    return static_cast<char>(as<signed char>());
   }
 
   template <typename T>