diff --git a/source/Commands/CommandObjectFrame.cpp b/source/Commands/CommandObjectFrame.cpp
index eab0d02..53de2b1 100644
--- a/source/Commands/CommandObjectFrame.cpp
+++ b/source/Commands/CommandObjectFrame.cpp
@@ -120,7 +120,7 @@
         {
             Error error;
             bool success = false;
-            char short_option = (char) m_getopt_table[option_idx].val;
+            const int short_option = m_getopt_table[option_idx].val;
             switch (short_option)
             {
             case 'r':