diff --git a/include/libc/libc_limits.h b/include/libc/libc_limits.h
index c2aa429229..32f7df1b1a 100644
--- a/include/libc/libc_limits.h
+++ b/include/libc/libc_limits.h
@@ -17,8 +17,12 @@
 
 #include <limits.h>
 
+#ifdef RT_USING_POSIX
+
 #ifndef SSIZE_MAX
 # define SSIZE_MAX      LONG_MAX
 #endif
 
 #endif
+
+#endif
diff --git a/include/libc/libc_stdio.h b/include/libc/libc_stdio.h
index 19d5fd4cc5..6201b85ea4 100644
--- a/include/libc/libc_stdio.h
+++ b/include/libc/libc_stdio.h
@@ -15,6 +15,10 @@
 #ifndef LIBC_STDIO_H__
 #define LIBC_STDIO_H__
 
+#ifdef RT_USING_POSIX
+
 #include <posix_getline.h>
 
 #endif
+
+#endif