diff --git a/system/lib/libc/emscripten_syscall_stubs.c b/system/lib/libc/emscripten_syscall_stubs.c
index 2a6d5d5267ec..6c65d9344b4f 100644
--- a/system/lib/libc/emscripten_syscall_stubs.c
+++ b/system/lib/libc/emscripten_syscall_stubs.c
@@ -28,7 +28,7 @@ static int g_pid = 42;
 static int g_pgid = 42;
 static int g_ppid = 1;
 static int g_sid = 42;
-static mode_t g_umask = S_IRWXU | S_IRWXG | S_IRWXO;
+static mode_t g_umask = 0 | S_IWGRP | S_IRWXO;
 
 #ifdef NDEBUG
 #define REPORT(name)