diff --git a/log/value.go b/log/value.go
index 5aceffeb5..66f0b81c0 100644
--- a/log/value.go
+++ b/log/value.go
@@ -32,6 +32,10 @@ func Caller(depth int) Valuer {
 	return func(context.Context) interface{} {
 		_, file, line, _ := runtime.Caller(depth)
 		idx := strings.LastIndexByte(file, '/')
+		if idx == -1 {
+			return file[idx+1:] + ":" + strconv.Itoa(line)
+		}
+		idx = strings.LastIndexByte(file[:idx], '/')
 		return file[idx+1:] + ":" + strconv.Itoa(line)
 	}
 }