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-rw-r--r--src/libstore/build.cc3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index c13ea6d23..77e968ddd 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -1793,6 +1793,9 @@ void DerivationGoal::startBuilder()
if (chdir(tmpDir.c_str()) == -1)
throw SysError(format("changing into `%1%'") % tmpDir);
+ /* Close all other file descriptors. */
+ closeMostFDs(set<int>());
+
#ifdef CAN_DO_LINUX32_BUILDS
/* Change the personality to 32-bit if we're doing an
i686-linux build on an x86_64-linux machine. */