1 files changed, 1 insertions, 1 deletions
diff --git a/libqpdf/JSON.cc b/libqpdf/JSON.cc
index df753b69..8565a831 100644
--- a/libqpdf/JSON.cc
+++ b/libqpdf/JSON.cc
@@ -197,7 +197,7 @@ JSON::encode_string(std::string const& str)
             }
             else
             {
-                result.append(1, ch);
+                result.append(1, static_cast<char>(ch));
             }
         }
     }