diff --git a/common/path.go b/common/path.go
index 6d0c92caab..69820cfe5d 100644
--- a/common/path.go
+++ b/common/path.go
@@ -40,10 +40,10 @@ func FileExist(filePath string) bool {
 	return true
 }
 
-// AbsolutePath returns Datadir + filename, or filename if it is absolute.
-func AbsolutePath(Datadir string, filename string) string {
+// AbsolutePath returns datadir + filename, or filename if it is absolute.
+func AbsolutePath(datadir string, filename string) string {
 	if filepath.IsAbs(filename) {
 		return filename
 	}
-	return filepath.Join(Datadir, filename)
+	return filepath.Join(datadir, filename)
 }