diff --git a/run_build.pl b/run_build.pl
index be167e6..1e8dc8f 100755
--- a/run_build.pl
+++ b/run_build.pl
@@ -1188,11 +1188,15 @@ sub get_stack_trace
     my $status = $? >>8;
     return () if $status;
 
+    open(GDBCMD, '>gdbcmd');
+    print GDBCMD "bt\n";
+    close(GDBCMD);
+
     my @trace;
 
     foreach my $core (@cores)
     {
-        my @onetrace = `gdb -ex bt --batch $bindir/postgres $core 2>&1`;
+        my @onetrace = `gdb -x gdbcmd --batch $bindir/postgres $core 2>&1`;
         push(@trace,
             "\n\n================== stack trace: $core ==================\n",
             @onetrace);