Index: kernel/generic/src/mm/backend_user.c
===================================================================
--- kernel/generic/src/mm/backend_user.c	(revision c81132d46eede2bacb1fa051d014dfb0a88d0ace)
+++ kernel/generic/src/mm/backend_user.c	(revision 62ca560dd1468a2f5b122d9ee3473a376d048bae)
@@ -49,4 +49,5 @@
 #include <errno.h>
 #include <log.h>
+#include <str.h>
 
 static bool user_create(as_area_t *);
@@ -130,6 +131,6 @@
 		log(LF_USPACE, LVL_FATAL,
 		    "Page-in request for page %#" PRIxPTR
-		    " at pager %d failed with error %d.",
-		    upage, pager_info->pager, rc);
+		    " at pager %d failed with error %s.",
+		    upage, pager_info->pager, str_error_name(rc));
 		return AS_PF_FAULT;
 	}