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-rw-r--r--apt-pkg/deb/dpkgpm.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/apt-pkg/deb/dpkgpm.cc b/apt-pkg/deb/dpkgpm.cc
index 565f01b84..3dca2b209 100644
--- a/apt-pkg/deb/dpkgpm.cc
+++ b/apt-pkg/deb/dpkgpm.cc
@@ -1005,7 +1005,7 @@ bool pkgDPkgPM::Go(int OutStatusFd)
// wait for input or output here
FD_ZERO(&rfds);
- if (!stdin_is_dev_null)
+ if (master >= 0 && !stdin_is_dev_null)
FD_SET(0, &rfds);
FD_SET(_dpkgin, &rfds);
if(master >= 0)