diff --git a/src/soc/intel/common/block/uart/uart.c b/src/soc/intel/common/block/uart/uart.c
index 5507663..142a936 100644
--- a/src/soc/intel/common/block/uart/uart.c
+++ b/src/soc/intel/common/block/uart/uart.c
@@ -37,7 +37,7 @@
 }
 
 #if CONFIG(INTEL_LPSS_UART_FOR_CONSOLE)
-uintptr_t uart_platform_base(int idx)
+uintptr_t uart_platform_base(unsigned int idx)
 {
 	if (idx == CONFIG_UART_FOR_CONSOLE)
 		return CONFIG_CONSOLE_UART_BASE_ADDRESS;