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-rw-r--r--lib/libz/zutil.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/libz/zutil.h b/lib/libz/zutil.h
index 37351c67415..11b93ebdd79 100644
--- a/lib/libz/zutil.h
+++ b/lib/libz/zutil.h
@@ -143,7 +143,7 @@ extern z_const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
# define OS_CODE 7
#endif
-#ifdef __acorn
+#if defined(__acorn) || defined(__riscos)
# define OS_CODE 13
#endif