diff --git a/newlib/libc/sys/rtems/include/sys/_bitset.h b/newlib/libc/sys/rtems/include/sys/_bitset.h
index df8dcab19..bf3f1bea2 100644
--- a/newlib/libc/sys/rtems/include/sys/_bitset.h
+++ b/newlib/libc/sys/rtems/include/sys/_bitset.h
@@ -57,4 +57,10 @@ struct t {								\
  */
 #define BITSET_DEFINE_VAR(t)	BITSET_DEFINE(t, 1)
 
+/*
+ * Define a default type that can be used while manually specifying size
+ * to every call.
+ */
+BITSET_DEFINE(bitset, 1);
+
 #endif /* !_SYS__BITSET_H_ */