diff --git a/tests/blink-allio.c b/tests/blink-allio.c
index 55c6e6eca..3fee31ec7 100644
--- a/tests/blink-allio.c
+++ b/tests/blink-allio.c
@@ -1,4 +1,8 @@
 #define MBAR_GPIO       0x80000000
+#define GPIO_FUNC_SEL0  0x80000018 /* GPIO 15 - 0;  2 bit blocks */
+#define GPIO_FUNC_SEL1  0x8000001c 
+#define GPIO_FUNC_SEL2  0x80000020 
+#define GPIO_FUNC_SEL3  0x80000024 
 #define GPIO_PAD_DIR0   0x80000000
 #define GPIO_DATA0      0x80000008
 #define GPIO_PAD_DIR1   0x80000004
@@ -15,6 +19,11 @@
 __attribute__ ((section ("startup")))
 void main(void) {
 	
+	*(volatile uint32_t *)GPIO_FUNC_SEL0 = 0xffffffff;
+	*(volatile uint32_t *)GPIO_FUNC_SEL1 = 0xffffffff;
+	*(volatile uint32_t *)GPIO_FUNC_SEL2 = 0xffffffff;
+	*(volatile uint32_t *)GPIO_FUNC_SEL3 = 0xffffffff;
+
 	*(volatile uint32_t *)GPIO_PAD_DIR0 = 0xffffffff;
 	*(volatile uint32_t *)GPIO_PAD_DIR1 = 0xffffffff;