diff --git a/config.go b/config.go
index 55637fb0b..70311ca7b 100644
--- a/config.go
+++ b/config.go
@@ -101,7 +101,7 @@ func NewProductionEncoderConfig() zapcore.EncoderConfig {
 		LevelKey:       "level",
 		NameKey:        "logger",
 		CallerKey:      "caller",
-		FunctionKey:    zapcore.OmitKey,
+		FunctionKey:    "function",
 		MessageKey:     "msg",
 		StacktraceKey:  "stacktrace",
 		LineEnding:     zapcore.DefaultLineEnding,
@@ -141,7 +141,7 @@ func NewDevelopmentEncoderConfig() zapcore.EncoderConfig {
 		LevelKey:       "L",
 		NameKey:        "N",
 		CallerKey:      "C",
-		FunctionKey:    zapcore.OmitKey,
+		FunctionKey:    "F",
 		MessageKey:     "M",
 		StacktraceKey:  "S",
 		LineEnding:     zapcore.DefaultLineEnding,