diff --git a/options.c b/options.c
index f86cc32..bd6d123 100644
--- a/options.c
+++ b/options.c
@@ -246,8 +246,12 @@ char **process_options(int argc, char **argv)
 	char *output = NULL;
 	char *cwd = NULL;
 
-	if (!sockdef)
-		asprintf(&sockdef, "/tmp/mtrace%u.sock", getuid());
+	if (!sockdef) {
+		if (asprintf(&sockdef, "/tmp/mtrace%u.sock", getuid()) == -1) {
+			fprintf(stderr, "%s\n", strerror(errno));
+			exit(1);
+		}
+	}
 
 	progname = argv[0];
 
diff --git a/sysdeps/linux-gnu/os.c b/sysdeps/linux-gnu/os.c
index fb0adaa..b54d91a 100644
--- a/sysdeps/linux-gnu/os.c
+++ b/sysdeps/linux-gnu/os.c
@@ -272,7 +272,7 @@ void *mem_scan(struct task *task, struct mt_msg *cmd, void *payload, unsigned lo
 			}
 
 			if (do_peek) {
-				if (copy_from_proc(task, ARCH_ADDR_T(start), page_buf, sizeof(page_buf)) != sizeof(page_buf)) {
+				if (copy_from_proc(task, ARCH_ADDR_T(start), page_buf, sizeof(page_buf)) != (int)sizeof(page_buf)) {
 					fprintf(stderr, "ptrace (%s)\n", strerror(errno));
 					break;
 				}