diff --git a/go/common/log/log.go b/go/common/log/log.go
index 56aac0078b..cdf187b0dc 100644
--- a/go/common/log/log.go
+++ b/go/common/log/log.go
@@ -58,7 +58,7 @@ func New(component string, level int, out string, ctx ...interface{}) gethlog.Lo
 	if out == SysOut {
 		s = gethlog.StreamHandler(os.Stdout, gethlog.TerminalFormat(false))
 	} else {
-		s1, err := gethlog.FileHandler(out, gethlog.TerminalFormat(false))
+		s1, err := gethlog.FileHandler(out, gethlog.LogfmtFormat())
 		if err != nil {
 			panic(err)
 		}
diff --git a/integration/common/testlog/testlog.go b/integration/common/testlog/testlog.go
index 02ccfb23c5..11f7cb0a58 100644
--- a/integration/common/testlog/testlog.go
+++ b/integration/common/testlog/testlog.go
@@ -45,7 +45,7 @@ func Setup(cfg *Cfg) *os.File {
 	}
 	logFile = f.Name()
 	// hardcode geth log level to error only
-	gethlog.Root().SetHandler(gethlog.LvlFilterHandler(cfg.LogLevel, gethlog.StreamHandler(f, gethlog.TerminalFormat(false))))
+	gethlog.Root().SetHandler(gethlog.LvlFilterHandler(cfg.LogLevel, gethlog.StreamHandler(f, gethlog.LogfmtFormat())))
 	testlog = gethlog.Root().New(log.CmpKey, log.TestLogCmp)
 	return f
 }