diff --git a/cmd/stfs/cmd/serve_ftp.go b/cmd/stfs/cmd/serve_ftp.go
index 50ba1c9..05475b0 100644
--- a/cmd/stfs/cmd/serve_ftp.go
+++ b/cmd/stfs/cmd/serve_ftp.go
@@ -193,6 +193,7 @@ var serveFTPCmd = &cobra.Command{
 				)
 			},
 			viper.GetBool(readOnlyFlag),
+			true, // FTP requires read permission even if `O_WRONLY` is set if cache is enabled
 
 			func(hdr *config.Header) {
 				jsonLogger.Trace("Header transform", hdr)
diff --git a/cmd/stfs/cmd/serve_http.go b/cmd/stfs/cmd/serve_http.go
index ae96b2d..64610f2 100644
--- a/cmd/stfs/cmd/serve_http.go
+++ b/cmd/stfs/cmd/serve_http.go
@@ -128,9 +128,10 @@ var serveHTTPCmd = &cobra.Command{
 				Metadata: metadataPersister,
 			},
 
-			"",   // We never write
-			nil,  // We never write
-			true, // We never write
+			"",    // We never write
+			nil,   // We never write
+			true,  // We never write
+			false, // We never write
 
 			func(hdr *config.Header) {
 				jsonLogger.Trace("Header transform", hdr)
diff --git a/examples/full/main.go b/examples/full/main.go
index e372356..be0b1bf 100644
--- a/examples/full/main.go
+++ b/examples/full/main.go
@@ -172,6 +172,7 @@ func createFs(
 			)
 		},
 		readOnly,
+		false,
 
 		func(hdr *config.Header) {
 			jsonLogger.Trace("Header transform", hdr)
diff --git a/examples/simple/main.go b/examples/simple/main.go
index 427dea8..59a57e5 100644
--- a/examples/simple/main.go
+++ b/examples/simple/main.go
@@ -99,6 +99,7 @@ func main() {
 			)
 		},
 		false,
+		false,
 
 		func(hdr *config.Header) {
 			l.Trace("Header transform", hdr)
diff --git a/pkg/fs/filesystem.go b/pkg/fs/filesystem.go
index 6029d6d..6efb8cc 100644
--- a/pkg/fs/filesystem.go
+++ b/pkg/fs/filesystem.go
@@ -34,6 +34,7 @@ type STFS struct {
 	compressionLevel string
 	getFileBuffer    func() (cache.WriteCache, func() error, error)
 	readOnly         bool
+	writeImpliesRead bool
 
 	ioLock sync.Mutex
 
@@ -50,6 +51,7 @@ func NewSTFS(
 	compressionLevel string,
 	getFileBuffer func() (cache.WriteCache, func() error, error),
 	readOnly bool,
+	writeImpliesRead bool,
 
 	onHeader func(hdr *config.Header),
 	log logging.StructuredLogger,
@@ -63,6 +65,7 @@ func NewSTFS(
 		compressionLevel: compressionLevel,
 		getFileBuffer:    getFileBuffer,
 		readOnly:         readOnly,
+		writeImpliesRead: writeImpliesRead,
 
 		onHeader: onHeader,
 		log:      log,
@@ -373,6 +376,10 @@ func (f *STFS) OpenFile(name string, flag int, perm os.FileMode) (afero.File, er
 		if (flag & O_ACCMODE) == os.O_RDONLY {
 			flags.Read = true
 		} else if (flag & O_ACCMODE) == os.O_WRONLY {
+			if f.writeImpliesRead {
+				flags.Read = true
+			}
+
 			flags.Write = true
 		} else if (flag & O_ACCMODE) == os.O_RDWR {
 			flags.Read = true
diff --git a/pkg/fs/filesystem_test.go b/pkg/fs/filesystem_test.go
index 10432d0..8d3457a 100644
--- a/pkg/fs/filesystem_test.go
+++ b/pkg/fs/filesystem_test.go
@@ -407,6 +407,7 @@ func createSTFS(
 			)
 		},
 		readOnly,
+		false,
 
 		func(hdr *config.Header) {
 			jsonLogger.Trace("Header transform", hdr)