diff --git a/pcbnew/exporters/gerber_jobfile_writer.cpp b/pcbnew/exporters/gerber_jobfile_writer.cpp
index 73c78ac484..f600a2a75e 100644
--- a/pcbnew/exporters/gerber_jobfile_writer.cpp
+++ b/pcbnew/exporters/gerber_jobfile_writer.cpp
@@ -66,7 +66,7 @@ std::string GERBER_JOBFILE_WRITER::formatStringFromUTF32( const wxString& aText
             fmt_text += char( letter );
         else
         {
-            char buff[10];
+            char buff[16];
             sprintf( buff, "\\u%4.4lX", letter );
             fmt_text += buff;
         }