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-rw-r--r--src/openttd.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/openttd.cpp b/src/openttd.cpp
index 869cb6f81..9886b9e17 100644
--- a/src/openttd.cpp
+++ b/src/openttd.cpp
@@ -446,7 +446,7 @@ int ttd_main(int argc, char *argv[])
* a letter means: it accepts that param (e.g.: -h)
* a ':' behind it means: it need a param (e.g.: -m<driver>)
* a '::' behind it means: it can optional have a param (e.g.: -d<debug>) */
- optformat = "m:s:v:b:hD::n::ei::I:S:t:d::r:g::G:c:xl:p:P:"
+ optformat = "m:s:v:b:hD::n::ei::I:S:M:t:d::r:g::G:c:xl:p:P:"
#if !defined(__MORPHOS__) && !defined(__AMIGA__) && !defined(WIN32)
"f"
#endif