diff --git a/sys/dev/uart/uart_bus.h b/sys/dev/uart/uart_bus.h
index 01752d0592c0..322e9a85e023 100644
--- a/sys/dev/uart/uart_bus.h
+++ b/sys/dev/uart/uart_bus.h
@@ -138,6 +138,7 @@ extern char uart_driver_name[];
 
 int uart_bus_attach(device_t dev);
 int uart_bus_detach(device_t dev);
+int uart_bus_resume(device_t dev);
 serdev_intr_t *uart_bus_ihand(device_t dev, int ipend);
 int uart_bus_ipend(device_t dev);
 int uart_bus_probe(device_t dev, int regshft, int rclk, int rid, int chan);
diff --git a/sys/dev/uart/uart_bus_acpi.c b/sys/dev/uart/uart_bus_acpi.c
index 756f7f28a838..ccd213da415e 100644
--- a/sys/dev/uart/uart_bus_acpi.c
+++ b/sys/dev/uart/uart_bus_acpi.c
@@ -47,6 +47,7 @@ static device_method_t uart_acpi_methods[] = {
 	DEVMETHOD(device_probe,		uart_acpi_probe),
 	DEVMETHOD(device_attach,	uart_bus_attach),
 	DEVMETHOD(device_detach,	uart_bus_detach),
+	DEVMETHOD(device_resume,	uart_bus_resume),
 	{ 0, 0 }
 };
 
diff --git a/sys/dev/uart/uart_bus_isa.c b/sys/dev/uart/uart_bus_isa.c
index 1836663c28ba..1fda15f2be02 100644
--- a/sys/dev/uart/uart_bus_isa.c
+++ b/sys/dev/uart/uart_bus_isa.c
@@ -50,6 +50,7 @@ static device_method_t uart_isa_methods[] = {
 	DEVMETHOD(device_probe,		uart_isa_probe),
 	DEVMETHOD(device_attach,	uart_bus_attach),
 	DEVMETHOD(device_detach,	uart_bus_detach),
+	DEVMETHOD(device_resume,	uart_bus_resume),
 	{ 0, 0 }
 };
 
diff --git a/sys/dev/uart/uart_bus_pci.c b/sys/dev/uart/uart_bus_pci.c
index 307ee340fc3b..4237fa43aeb3 100644
--- a/sys/dev/uart/uart_bus_pci.c
+++ b/sys/dev/uart/uart_bus_pci.c
@@ -51,6 +51,7 @@ static device_method_t uart_pci_methods[] = {
 	DEVMETHOD(device_probe,		uart_pci_probe),
 	DEVMETHOD(device_attach,	uart_bus_attach),
 	DEVMETHOD(device_detach,	uart_bus_detach),
+	DEVMETHOD(device_resume,	uart_bus_resume),
 	{ 0, 0 }
 };
 
diff --git a/sys/dev/uart/uart_core.c b/sys/dev/uart/uart_core.c
index 47d5f3d97713..f5a9a1c3de27 100644
--- a/sys/dev/uart/uart_core.c
+++ b/sys/dev/uart/uart_core.c
@@ -590,3 +590,12 @@ uart_bus_detach(device_t dev)
 
 	return (0);
 }
+
+int
+uart_bus_resume(device_t dev)
+{
+	struct uart_softc *sc;
+
+	sc = device_get_softc(dev);
+	return (UART_ATTACH(sc));
+}