diff --git a/jerry-libc/target/posix/jerry-libc-target.c b/jerry-libc/target/posix/jerry-libc-target.c
index 2fb51e630..aac25b531 100644
--- a/jerry-libc/target/posix/jerry-libc-target.c
+++ b/jerry-libc/target/posix/jerry-libc-target.c
@@ -178,7 +178,7 @@ fopen (const char *path, /**< file path */
 
   long int ret = syscall_3 (SYSCALL_NO (open), (long int) path, flags, access);
 
-  return (void *) (uintptr_t) (ret);
+  return ((ret < 0) ? NULL : (void *) (uintptr_t) (ret));
 } /* fopen */
 
 /**