diff --git a/src/osdef1.h.in b/src/osdef1.h.in
index 825fe94..4fb3409 100644
--- a/src/osdef1.h.in
+++ b/src/osdef1.h.in
@@ -65,7 +65,7 @@
 #  endif
 # endif
 #endif
-#ifndef __BIONIC__  // Android's libc #defines bzero to memset.
+#if !defined(__BIONIC__) && !defined(__HAIKU__)  // Android's libc #defines bzero to memset.
 // used inside of FD_ZERO macro
 extern void	bzero(void *, size_t);
 #endif