diff --git a/core/iwasm/libraries/libc-wasi/sandboxed-system-primitives/src/ssp_config.h b/core/iwasm/libraries/libc-wasi/sandboxed-system-primitives/src/ssp_config.h
index 5ffcb6b37..47b65ca82 100644
--- a/core/iwasm/libraries/libc-wasi/sandboxed-system-primitives/src/ssp_config.h
+++ b/core/iwasm/libraries/libc-wasi/sandboxed-system-primitives/src/ssp_config.h
@@ -51,11 +51,17 @@
 #define CONFIG_HAS_FDATASYNC 0
 #endif
 
+/*
+ * For NuttX, CONFIG_HAS_ISATTY is provided by its platform header.
+ * (platform_internal.h)
+ */
+#ifndef __NuttX__
 #ifndef __CloudABI__
 #define CONFIG_HAS_ISATTY 1
 #else
 #define CONFIG_HAS_ISATTY 0
 #endif
+#endif
 
 #ifndef __APPLE__
 #define CONFIG_HAS_POSIX_FALLOCATE 1