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-rw-r--r--boost/asio/detail/impl/socket_ops.ipp1
1 files changed, 1 insertions, 0 deletions
diff --git a/boost/asio/detail/impl/socket_ops.ipp b/boost/asio/detail/impl/socket_ops.ipp
index 24d2d66ad1..16e95366e6 100644
--- a/boost/asio/detail/impl/socket_ops.ipp
+++ b/boost/asio/detail/impl/socket_ops.ipp
@@ -18,6 +18,7 @@
#include <boost/asio/detail/config.hpp>
#include <boost/assert.hpp>
#include <boost/detail/workaround.hpp>
+#include <cctype>
#include <cstdio>
#include <cstdlib>
#include <cstring>