diff --git a/src/gui.c b/src/gui.c
index 03776b66..b8fa735b 100644
--- a/src/gui.c
+++ b/src/gui.c
@@ -63,6 +63,7 @@
 #include "hpa_dco.h"
 #include "customers.h"
 #include "conf.h"
+#include "unistd.h"
 
 #define NWIPE_GUI_PANE 8
 
@@ -1349,6 +1350,19 @@ void nwipe_gui_select( int count, nwipe_context_t** c )
 
                     break;
 
+                case 'd':
+
+                    /* The d key is only meaningful for ShredOS, it toggles the fontsize */
+                    if( access( "/usr/bin/shredos_toggle_font_size.sh", F_OK ) == 0 )
+                    {
+                        if( system( "/usr/bin/shredos_toggle_font_size.sh > /dev/null 2>&1" ) == 0 )
+                        {
+                            nwipe_log( NWIPE_LOG_INFO, "Toggle font size" );
+                        }
+                    }
+
+                    break;
+
             } /* keystroke switch */
 
             /* Check the terminal size, if the user has changed it the while loop checks for