diff --git a/pkg/tcpip/link/sharedmem/sharedmem.go b/pkg/tcpip/link/sharedmem/sharedmem.go
index f8838d8a0..18e25f3d2 100644
--- a/pkg/tcpip/link/sharedmem/sharedmem.go
+++ b/pkg/tcpip/link/sharedmem/sharedmem.go
@@ -298,7 +298,7 @@ func (e *endpoint) IsAttached() bool {
 // MTU implements stack.LinkEndpoint.MTU. It returns the value initialized
 // during construction.
 func (e *endpoint) MTU() uint32 {
-	return e.mtu - e.hdrSize
+	return e.mtu
 }
 
 // Capabilities implements stack.LinkEndpoint.Capabilities.
diff --git a/pkg/tcpip/link/sharedmem/sharedmem_server.go b/pkg/tcpip/link/sharedmem/sharedmem_server.go
index 7c5f5571d..9d7773fb4 100644
--- a/pkg/tcpip/link/sharedmem/sharedmem_server.go
+++ b/pkg/tcpip/link/sharedmem/sharedmem_server.go
@@ -184,7 +184,7 @@ func (e *serverEndpoint) IsAttached() bool {
 // MTU implements stack.LinkEndpoint.MTU. It returns the value initialized
 // during construction.
 func (e *serverEndpoint) MTU() uint32 {
-	return e.mtu - e.hdrSize
+	return e.mtu
 }
 
 // Capabilities implements stack.LinkEndpoint.Capabilities.