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-rw-r--r--src/libutil/serialise.hh4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/libutil/serialise.hh b/src/libutil/serialise.hh
index 5746c3c2fcf9..6a74c4cf6ea1 100644
--- a/src/libutil/serialise.hh
+++ b/src/libutil/serialise.hh
@@ -35,7 +35,7 @@ struct FdSink : Sink
 
     FdSink()
     {
-        fd = 0;
+        fd = -1;
     }
     
     FdSink(int fd) 
@@ -54,7 +54,7 @@ struct FdSource : Source
 
     FdSource()
     {
-        fd = 0;
+        fd = -1;
     }
     
     FdSource(int fd)