diff --git a/lib/libc/minimal/include/string.h b/lib/libc/minimal/include/string.h
index e24b43d3aa9daff1ad38c11727036fb86f465b19..5989c886e7b324b90c2aa75df6d4314aec31972e 100644
--- a/lib/libc/minimal/include/string.h
+++ b/lib/libc/minimal/include/string.h
@@ -20,6 +20,9 @@ typedef unsigned short u16;
 typedef unsigned int u32;
 typedef unsigned long long u64;
 typedef signed long long s64;
+#ifdef CONFIG_KERNEL_RHINO
+typedef unsigned int size_t;
+#endif
 
 /*
  * We don't do inline string functions, since the