diff --git a/log.go b/log.go
index c2c1795..07c06a8 100644
--- a/log.go
+++ b/log.go
@@ -87,6 +87,10 @@ func New(opts Opts) Logger {
 		opts.CallerSkipFrameCount = 3
 	}
 
+	if len(opts.DefaultFields)%2 != 0 {
+		opts.DefaultFields = opts.DefaultFields[0 : len(opts.DefaultFields)-1]
+	}
+
 	return Logger{
 		out:  newSyncWriter(opts.Writer),
 		Opts: opts,