1 files changed, 1 insertions, 0 deletions
diff --git a/compat/mingw.h b/compat/mingw.h
index a1808b4e6..69bb43dc3 100644
--- a/compat/mingw.h
+++ b/compat/mingw.h
@@ -142,6 +142,7 @@ static inline int fcntl(int fd, int cmd, ...)
 #define sigemptyset(x) (void)0
 static inline int sigaddset(sigset_t *set, int signum)
 { return 0; }
+#define SIG_BLOCK 0
 #define SIG_UNBLOCK 0
 static inline int sigprocmask(int how, const sigset_t *set, sigset_t *oldset)
 { return 0; }