diff --git a/kal/libc/newlib/porting/include/limits.h b/kal/libc/newlib/porting/include/limits.h
index a6200cd1..912ac46d 100644
--- a/kal/libc/newlib/porting/include/limits.h
+++ b/kal/libc/newlib/porting/include/limits.h
@@ -41,4 +41,6 @@
 #define PATH_MAX 256
 #define NAME_MAX 256
 
+#define PTHREAD_KEYS_MAX 128
+
 #endif /* !_ADAPT_LIMITS_H */