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-rw-r--r--winsup/cygwin/winsup.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/winsup/cygwin/winsup.h b/winsup/cygwin/winsup.h
index d61f6950f..4b549dde9 100644
--- a/winsup/cygwin/winsup.h
+++ b/winsup/cygwin/winsup.h
@@ -131,7 +131,7 @@ extern int cygserver_running;
})
/* Convert a signal to a signal mask */
-#define SIGTOMASK(sig) (1 << ((sig) - 1))
+#define SIGTOMASK(sig) ((sigset_t) 1 << ((sig) - 1))
#define set_api_fatal_return(n) do {extern int __api_fatal_exit_val; __api_fatal_exit_val = (n);} while (0)