diff --git a/scripts/build-remote.pl.in b/scripts/build-remote.pl.in
index dddd9e959e..bdb6f24669 100755
--- a/scripts/build-remote.pl.in
+++ b/scripts/build-remote.pl.in
@@ -46,7 +46,7 @@ sub all { $_ || return 0 for @_; 1 }
 # Initialisation.
 my $loadIncreased = 0;
 
-my ($localSystem, $maxSilentTime, $printBuildTrace, $buildTimeout) = @ARGV;
+my ($localSystem, $printBuildTrace) = @ARGV;
 
 my $currentLoad = $ENV{"NIX_CURRENT_LOAD"};
 my $conf = $ENV{"NIX_REMOTE_SYSTEMS"};
@@ -258,8 +258,7 @@ close UPLOADLOCK;
 
 # Perform the build.
 my $buildFlags =
-    "--max-silent-time $maxSilentTime --option build-timeout $buildTimeout"
-    . " --fallback --add-root $rootsDir/\$PPID.out --quiet"
+    " --fallback --add-root $rootsDir/\$PPID.out --quiet"
     . " --option build-keep-log false";
 
 # We let the remote side kill its process group when the connection is
diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index 3f595e34fe..e1aa0681cf 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -695,9 +695,7 @@ HookInstance::HookInstance()
                 throw SysError("dupping builder's stdout/stderr");
 
             execl(buildHook.c_str(), buildHook.c_str(), settings.thisSystem.c_str(),
-                (format("%1%") % settings.maxSilentTime).str().c_str(),
                 (format("%1%") % settings.printBuildTrace).str().c_str(),
-                (format("%1%") % settings.buildTimeout).str().c_str(),
                 NULL);
 
             throw SysError(format("executing `%1%'") % buildHook);
@@ -1646,7 +1644,7 @@ HookReply DerivationGoal::tryBuildHook()
     set<int> fds;
     fds.insert(hook->fromHook.readSide);
     fds.insert(hook->builderOut.readSide);
-    worker.childStarted(shared_from_this(), hook->pid, fds, false, false);
+    worker.childStarted(shared_from_this(), hook->pid, fds, false, true);
 
     if (settings.printBuildTrace)
         printMsg(lvlError, format("@ build-started %1% %2% %3% %4%")