diff --git a/arch/arm/mach-sa1100/assabet.c b/arch/arm/mach-sa1100/assabet.c
index 6356896587bfd65059734bbb5490e715a3b192c9..e3805d4c052a6619a470031863f2e1215086017c 100644
--- a/arch/arm/mach-sa1100/assabet.c
+++ b/arch/arm/mach-sa1100/assabet.c
@@ -214,6 +214,14 @@ static void __init assabet_init(void)
 	GPCR = GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM;
 	GPDR |= GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM;
 
+	/*
+	 * Also set GPIO27 as an output; this is used to clock UART3
+	 * via the FPGA and as otherwise has no pullups or pulldowns,
+	 * so stop it floating.
+	 */
+	GPCR = GPIO_GPIO27;
+	GPDR |= GPIO_GPIO27;
+
 	/*
 	 * Set up registers for sleep mode.
 	 */