diff --git a/src/system/libroot/posix/stdlib/realpath.c b/src/system/libroot/posix/stdlib/realpath.c
index 8c5a3187da..5b4b93a12f 100644
--- a/src/system/libroot/posix/stdlib/realpath.c
+++ b/src/system/libroot/posix/stdlib/realpath.c
@@ -58,6 +58,11 @@ realpath(const char *path, char *resolved)
 	char *p, *q, wbuf[MAXPATHLEN];
 	int symlinks = 0;
 
+	if (path == NULL || resolved == NULL) {
+		errno = EINVAL;
+		return NULL;
+	}
+
 	/* Save the starting point. */
 	if ((fd = open(".", O_RDONLY)) < 0) {
 		strcpy(resolved, ".");