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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 3d296cf6d8d6..1b3fb744fdf5 100644
--- a/src/libutil/serialise.hh
+++ b/src/libutil/serialise.hh
@@ -72,8 +72,8 @@ struct BufferedSource : Source
 struct FdSink : BufferedSink
 {
     int fd;
-    bool warn;
-    size_t written;
+    bool warn = false;
+    size_t written = 0;
 
     FdSink() : fd(-1) { }
     FdSink(int fd) : fd(fd) { }