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-rw-r--r--src/libstore/build.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index e846995f76bb..5a869ead610d 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -413,6 +413,7 @@ static void restoreSIGPIPE()
     struct sigaction act, oact;
     act.sa_handler = SIG_DFL;
     act.sa_flags = 0;
+    sigemptyset(&act.sa_mask);
     if (sigaction(SIGPIPE, &act, &oact)) throw SysError("resetting SIGPIPE");
 }