diff --git a/samples/usb/cdc_acm/prj.conf b/samples/usb/cdc_acm/prj.conf
index 41421399f28..48b2dee63ae 100644
--- a/samples/usb/cdc_acm/prj.conf
+++ b/samples/usb/cdc_acm/prj.conf
@@ -10,4 +10,3 @@ CONFIG_SYS_LOG_USB_LEVEL=0
 CONFIG_SERIAL=y
 CONFIG_UART_INTERRUPT_DRIVEN=y
 CONFIG_UART_LINE_CTRL=y
-CONFIG_SYS_LOG=y
diff --git a/samples/usb/cdc_acm/src/main.c b/samples/usb/cdc_acm/src/main.c
index c3e7190317e..546110b5311 100644
--- a/samples/usb/cdc_acm/src/main.c
+++ b/samples/usb/cdc_acm/src/main.c
@@ -28,9 +28,13 @@
 #include <uart.h>
 #include <zephyr.h>
 
-#define SYS_LOG_LEVEL SYS_LOG_LEVEL_INFO
-#include <misc/sys_log.h>
-
+#if defined(CONFIG_STDOUT_CONSOLE)
+#include <stdio.h>
+#define PRINT           printf
+#else
+#include <misc/printk.h>
+#define PRINT           printk
+#endif
 
 static const char *banner1 = "Send characters to the UART device\r\n";
 static const char *banner2 = "Characters read:\r\n";
@@ -86,35 +90,35 @@ void main(void)
 
 	dev = device_get_binding(CONFIG_CDC_ACM_PORT_NAME);
 	if (!dev) {
-		SYS_LOG_INF("CDC ACM device not found");
+		PRINT("CDC ACM device not found\n");
 		return;
 	}
 
-	SYS_LOG_INF("Wait for DTR");
+	PRINT("Wait for DTR\n");
 	while (1) {
 		uart_line_ctrl_get(dev, LINE_CTRL_DTR, &dtr);
 		if (dtr)
 			break;
 	}
-	SYS_LOG_INF("DTR set, start test");
+	PRINT("DTR set, start test\n");
 
 	/* They are optional, we use them to test the interrupt endpoint */
 	ret = uart_line_ctrl_set(dev, LINE_CTRL_DCD, 1);
 	if (ret)
-		SYS_LOG_INF("Failed to set DCD, ret code %d", ret);
+		PRINT("Failed to set DCD, ret code %d\n", ret);
 
 	ret = uart_line_ctrl_set(dev, LINE_CTRL_DSR, 1);
 	if (ret)
-		SYS_LOG_INF("Failed to set DSR, ret code %d", ret);
+		PRINT("Failed to set DSR, ret code %d\n", ret);
 
 	/* Wait 1 sec for the host to do all settings */
 	sys_thread_busy_wait(1000000);
 
 	ret = uart_line_ctrl_get(dev, LINE_CTRL_BAUD_RATE, &baudrate);
 	if (ret)
-		SYS_LOG_INF("Failed to get baudrate, ret code %d", ret);
+		PRINT("Failed to get baudrate, ret code %d\n", ret);
 	else
-		SYS_LOG_INF("Baudrate detected: %d", baudrate);
+		PRINT("Baudrate detected: %d\n", baudrate);
 
 	uart_irq_callback_set(dev, interrupt_handler);
 	write_data(dev, banner1, strlen(banner1));
diff --git a/samples/usb/dfu/prj.conf b/samples/usb/dfu/prj.conf
index e9c17c14194..e4bdc399f91 100644
--- a/samples/usb/dfu/prj.conf
+++ b/samples/usb/dfu/prj.conf
@@ -4,7 +4,8 @@ CONFIG_ARC_INIT=n
 CONFIG_USB=y
 CONFIG_USB_DW=y
 CONFIG_USB_DEVICE_STACK=y
-CONFIG_SYS_LOG=y
+#Un comment to enable logging
+#CONFIG_SYS_LOG=y
 CONFIG_SYS_LOG_USB_DFU_LEVEL=0
 CONFIG_SYS_LOG_USB_DW_LEVEL=0
 CONFIG_SYS_LOG_USB_LEVEL=0
diff --git a/samples/usb/dfu/src/main.c b/samples/usb/dfu/src/main.c
index 57d01347424..4be63c8d3c1 100644
--- a/samples/usb/dfu/src/main.c
+++ b/samples/usb/dfu/src/main.c
@@ -27,8 +27,13 @@
 #include <zephyr.h>
 #include "usb_dfu.h"
 
-#define SYS_LOG_LEVEL SYS_LOG_LEVEL_INFO
-#include <misc/sys_log.h>
+#if defined(CONFIG_STDOUT_CONSOLE)
+#include <stdio.h>
+#define PRINT           printf
+#else
+#include <misc/printk.h>
+#define PRINT           printk
+#endif
 
 #ifdef CONFIG_SOC_QUARK_SE
 #define DFU_FLASH_DEVICE "QUARK_FLASH"
@@ -44,11 +49,11 @@ void main(void)
 {
 	struct device *dev = NULL;
 
-	SYS_LOG_INF("DFU Test Application");
+	PRINT("DFU Test Application\n");
 
 	dev = device_get_binding(DFU_FLASH_DEVICE);
 	if (!dev) {
-		SYS_LOG_ERR("Flash device not found");
+		printf("Flash device not found\n");
 		return;
 	}