diff --git a/fsimpl/fsimpl_test.go b/fsimpl/fsimpl_test.go
index 1819377..ec78abc 100644
--- a/fsimpl/fsimpl_test.go
+++ b/fsimpl/fsimpl_test.go
@@ -104,6 +104,26 @@ func TestJoinCleanPath(t *testing.T) {
 			args: args{uriParts: nil, trimPrefix: ``, separator: ``},
 			want: `.`,
 		},
+		{
+			name: `. with sep`,
+			args: args{uriParts: []string{`.`}, trimPrefix: ``, separator: `/`},
+			want: `/`,
+		},
+		{
+			name: `. without sep`,
+			args: args{uriParts: []string{`.`}, trimPrefix: ``, separator: ``},
+			want: `.`,
+		},
+		{
+			name: `relative no sep`,
+			args: args{uriParts: []string{`relative`}, trimPrefix: ``, separator: ``},
+			want: `relative`,
+		},
+		{
+			name: `relative with sep`,
+			args: args{uriParts: []string{`relative`}, trimPrefix: ``, separator: `/`},
+			want: `/relative`,
+		},
 		{
 			name: `C:`,
 			args: args{uriParts: nil, trimPrefix: `C:`, separator: `\`},
@@ -124,6 +144,11 @@ func TestJoinCleanPath(t *testing.T) {
 			args: args{uriParts: nil, trimPrefix: `C:\`, separator: `/`},
 			want: `/`,
 		},
+		{
+			name: `ftp://example.com/dir/subdir/`,
+			args: args{uriParts: []string{`ftp://example.com/dir/`, `./subdir/`}, trimPrefix: `ftp://`, separator: `/`},
+			want: `/example.com/dir/subdir`,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
diff --git a/sftpfs/sftpfs.go b/sftpfs/sftpfs.go
index cda3485..f243bec 100644
--- a/sftpfs/sftpfs.go
+++ b/sftpfs/sftpfs.go
@@ -26,7 +26,7 @@ const (
 func init() {
 	// Register with prefix sftp:// for URLs with
 	// sftp://username:password@host:port schema.
-	fs.Register(new(fileSystem))
+	fs.Register(&fileSystem{prefix: Prefix})
 }
 
 // LoginCallback is called by Dial to get the username and password for a SFTP connection.
@@ -248,9 +248,6 @@ func (f *fileSystem) ID() (string, error) {
 }
 
 func (f *fileSystem) Prefix() string {
-	if f.prefix == "" {
-		return Prefix
-	}
 	return f.prefix
 }
 
@@ -263,20 +260,26 @@ func (f *fileSystem) String() string {
 }
 
 func (*fileSystem) URL(cleanPath string) string {
+	// Prefix was trimmed from cleanPath in JoinCleanPath
 	return Prefix + cleanPath
 }
 
-func (f *fileSystem) JoinCleanFile(uriParts ...string) fs.File {
-	println("sftpfs.JoinCleanFile", f.prefix, f.JoinCleanPath(uriParts...))
-	return fs.File(f.prefix + f.JoinCleanPath(uriParts...))
-}
-
 func (*fileSystem) JoinCleanPath(uriParts ...string) string {
 	return fsimpl.JoinCleanPath(uriParts, Prefix, Separator)
 }
 
+func (f *fileSystem) JoinCleanFile(uriParts ...string) fs.File {
+	path := f.JoinCleanPath(uriParts...)
+	if strings.HasSuffix(f.prefix, Separator) && strings.HasPrefix(path, Separator) {
+		// For example: "sftp://" + "/example.com/absolute/path"
+		// should not result in "sftp:///example.com/absolute/path"
+		path = path[len(Separator):]
+	}
+	return fs.File(f.prefix + path)
+}
+
 func (f *fileSystem) SplitPath(filePath string) []string {
-	return fsimpl.SplitPath(filePath, f.Prefix(), Separator)
+	return fsimpl.SplitPath(filePath, f.prefix, Separator)
 }
 
 func (f *fileSystem) Separator() string { return Separator }