Index: uspace/drv/nic/ar9271/ar9271.c
===================================================================
--- uspace/drv/nic/ar9271/ar9271.c	(revision 071a1ddbcc6bb2b9c6f3c1a3acc865f1f23b5fe0)
+++ uspace/drv/nic/ar9271/ar9271.c	(revision 6a32cc5f9f405da0c7afb110e787059cfec044b8)
@@ -42,4 +42,5 @@
 #include <ddf/interrupt.h>
 #include <errno.h>
+#include <str_error.h>
 #include <nic.h>
 #include <macros.h>
@@ -784,5 +785,5 @@
 			free(buffer);
 			usb_log_error("Error while uploading firmware. "
-			    "Error: %d\n", rc);
+			    "Error: %s\n", str_error_name(rc));
 			return rc;
 		}
@@ -836,5 +837,5 @@
 	if (rc != EOK) {
 		usb_log_error("Failed to create USB device: %s, "
-		    "ERR_NUM = %d\n", err_msg, rc);
+		    "ERR_NUM = %s\n", err_msg, str_error_name(rc));
 		return NULL;
 	}
@@ -853,6 +854,6 @@
 	if (rc != EOK) {
 		free(ar9271);
-		usb_log_error("Failed to initialize AR9271 structure: %d\n",
-		    rc);
+		usb_log_error("Failed to initialize AR9271 structure: %s\n",
+		    str_error_name(rc));
 		return NULL;
 	}
Index: uspace/drv/nic/ar9271/htc.c
===================================================================
--- uspace/drv/nic/ar9271/htc.c	(revision 071a1ddbcc6bb2b9c6f3c1a3acc865f1f23b5fe0)
+++ uspace/drv/nic/ar9271/htc.c	(revision 6a32cc5f9f405da0c7afb110e787059cfec044b8)
@@ -36,4 +36,5 @@
 #include <byteorder.h>
 #include <errno.h>
+#include <str_error.h>
 #include "wmi.h"
 #include "htc.h"
@@ -264,5 +265,5 @@
 	if (rc != EOK) {
 		free(buffer);
-		usb_log_error("Failed to send HTC message. Error: %d\n", rc);
+		usb_log_error("Failed to send HTC message. Error: %s\n", str_error_name(rc));
 		return rc;
 	}
@@ -278,5 +279,5 @@
 		free(buffer);
 		usb_log_error("Failed to receive HTC service connect response. "
-		    "Error: %d\n", rc);
+		    "Error: %s\n", str_error_name(rc));
 		return rc;
 	}
@@ -331,5 +332,5 @@
 		free(buffer);
 		usb_log_error("Failed to send HTC config message. "
-		    "Error: %d\n", rc);
+		    "Error: %s\n", str_error_name(rc));
 		return rc;
 	}
@@ -344,5 +345,5 @@
 	if (rc != EOK) {
 		usb_log_error("Failed to receive HTC config response message. "
-		    "Error: %d\n", rc);
+		    "Error: %s\n", str_error_name(rc));
 	}
 	
@@ -376,5 +377,5 @@
 	if (rc != EOK)
 		usb_log_error("Failed to send HTC setup complete message. "
-		    "Error: %d\n", rc);
+		    "Error: %s\n", str_error_name(rc));
 	
 	free(buffer);
@@ -404,5 +405,5 @@
 		free(buffer);
 		usb_log_error("Failed to receive HTC check ready message. "
-		    "Error: %d\n", rc);
+		    "Error: %s\n", str_error_name(rc));
 		return rc;
 	}
Index: uspace/drv/nic/ar9271/wmi.c
===================================================================
--- uspace/drv/nic/ar9271/wmi.c	(revision 071a1ddbcc6bb2b9c6f3c1a3acc865f1f23b5fe0)
+++ uspace/drv/nic/ar9271/wmi.c	(revision 6a32cc5f9f405da0c7afb110e787059cfec044b8)
@@ -35,4 +35,5 @@
 #include <usb/debug.h>
 #include <errno.h>
+#include <str_error.h>
 #include <stdlib.h>
 #include <mem.h>
@@ -245,5 +246,5 @@
 	if (rc != EOK) {
 		free(buffer);
-		usb_log_error("Failed to send WMI message. Error: %d\n", rc);
+		usb_log_error("Failed to send WMI message. Error: %s\n", str_error_name(rc));
 		return rc;
 	}
@@ -268,5 +269,5 @@
 			free(buffer);
 			usb_log_error("Failed to receive WMI message response. "
-			    "Error: %d\n", rc);
+			    "Error: %s\n", str_error_name(rc));
 			return rc;
 		}
Index: uspace/drv/nic/rtl8169/driver.c
===================================================================
--- uspace/drv/nic/rtl8169/driver.c	(revision 071a1ddbcc6bb2b9c6f3c1a3acc865f1f23b5fe0)
+++ uspace/drv/nic/rtl8169/driver.c	(revision 6a32cc5f9f405da0c7afb110e787059cfec044b8)
@@ -30,4 +30,5 @@
 #include <async.h>
 #include <errno.h>
+#include <str_error.h>
 #include <align.h>
 #include <byteorder.h>
@@ -430,5 +431,5 @@
 	rc = rtl8169_register_int_handler(nic_data, &irq_cap);
 	if (rc != EOK) {
-		ddf_msg(LVL_ERROR, "Failed to register IRQ handler (%d)", rc);
+		ddf_msg(LVL_ERROR, "Failed to register IRQ handler (%s)", str_error_name(rc));
 		goto err_irq;
 	}
@@ -706,5 +707,5 @@
 	rc = rtl8169_allocate_buffers(rtl8169);
 	if (rc != EOK) {
-		ddf_msg(LVL_ERROR, "Error allocating buffers: %d", rc);
+		ddf_msg(LVL_ERROR, "Error allocating buffers: %s", str_error_name(rc));
 		return 0;
 	}