diff --git a/include/limits.h b/include/limits.h
index e12618af..ae05f1a0 100644
--- a/include/limits.h
+++ b/include/limits.h
@@ -37,7 +37,7 @@
 #define MB_LEN_MAX 4
 
 #if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE)
+ || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 
 #define PIPE_BUF 4096
 #define PAGESIZE PAGE_SIZE