diff --git a/testcases/complete-run.pl b/testcases/complete-run.pl
index 6f00877c..8f740d8c 100755
--- a/testcases/complete-run.pl
+++ b/testcases/complete-run.pl
@@ -242,7 +242,7 @@ sub take_job {
 
         my $output;
         my $parser = TAP::Parser->new({
-            exec => [ 'sh', '-c', "DISPLAY=$display /usr/bin/perl -It/lib $test" ],
+            exec => [ 'sh', '-c', qq|DISPLAY=$display LOGPATH="$logpath" /usr/bin/perl -It/lib $test| ],
             spool => IO::Scalar->new(\$output),
             merge => 1,
         });
diff --git a/testcases/t/lib/i3test.pm b/testcases/t/lib/i3test.pm
index 749b89b7..3d2d85af 100644
--- a/testcases/t/lib/i3test.pm
+++ b/testcases/t/lib/i3test.pm
@@ -259,7 +259,10 @@ sub launch_with_config {
     say $fh "ipc-socket $tmp_socket_path";
     close($fh);
 
-    my $i3cmd = "exec " . abs_path("../i3") . " -V -d all --disable-signalhandler -c $tmpfile >/dev/null 2>/dev/null";
+    # Use $ENV{LOGPATH}, gets set in complete-run.pl. We append instead of
+    # overwrite because there might be multiple instances of i3 running during
+    # one test case.
+    my $i3cmd = "exec " . abs_path("../i3") . " -V -d all --disable-signalhandler -c $tmpfile >>$ENV{LOGPATH} 2>&1";
     my $process = Proc::Background->new($i3cmd);
     sleep 1;