diff --git a/common/main.cc b/common/main.cc
index 6d76f1f..48896bf 100644
--- a/common/main.cc
+++ b/common/main.cc
@@ -148,7 +148,7 @@ int main( int argc, char** argv )
 
   int c;
   // while c != -1
-  while( (c = getopt_long( argc, argv, "hi:cg:m:a:t:", long_options, NULL) ) != -1 )
+  while( (c = getopt_long( argc, argv, "hi:cpg:m:a:t:", long_options, NULL) ) != -1 )
   {
     switch( c )
     {