diff --git a/conversions.go b/conversions.go
index c330f8a..ddb57d5 100644
--- a/conversions.go
+++ b/conversions.go
@@ -294,8 +294,16 @@ func convertInMessage(
 		}
 
 	case fusekernel.OpOpen:
+		type input fusekernel.OpenIn
+		in := (*input)(inMsg.Consume(unsafe.Sizeof(input{})))
+		if in == nil {
+			return nil, errors.New("Corrupt OpOpen")
+		}
+		openFlags := fusekernel.OpenFlags(in.Flags)
+
 		o = &fuseops.OpenFileOp{
 			Inode:     fuseops.InodeID(inMsg.Header().Nodeid),
+			OpenFlags: &openFlags,
 			OpContext: fuseops.OpContext{Pid: inMsg.Header().Pid},
 		}
 
diff --git a/fuseops/ops.go b/fuseops/ops.go
index 06537d9..0f51b25 100644
--- a/fuseops/ops.go
+++ b/fuseops/ops.go
@@ -17,6 +17,8 @@ package fuseops
 import (
 	"os"
 	"time"
+
+	"github.com/jacobsa/fuse/internal/fusekernel"
 )
 
 ////////////////////////////////////////////////////////////////////////
@@ -646,6 +648,8 @@ type OpenFileOp struct {
 	// advance, for example, because contents are generated on the fly.
 	UseDirectIO bool
 
+	OpenFlags *fusekernel.OpenFlags
+
 	OpContext OpContext
 }
 
diff --git a/samples/memfs/memfs.go b/samples/memfs/memfs.go
index a09e79f..3fb0206 100644
--- a/samples/memfs/memfs.go
+++ b/samples/memfs/memfs.go
@@ -661,6 +661,9 @@ func (fs *memFS) OpenFile(
 		// OpenFileOp should have a valid pid in context.
 		return fuse.EINVAL
 	}
+	if op.OpenFlags == nil {
+		return fuse.EINVAL
+	}
 
 	fs.mu.Lock()
 	defer fs.mu.Unlock()