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-rw-r--r--gui/twmsg.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/gui/twmsg.cpp b/gui/twmsg.cpp
index 00c693150..f9ffefc53 100644
--- a/gui/twmsg.cpp
+++ b/gui/twmsg.cpp
@@ -21,6 +21,7 @@
#include "resources.hpp"
#include "twmsg.h"
+#include <cctype>
std::string Message::GetFormatString(const std::string& name) const
{