diff --git a/ChangeLog b/ChangeLog
index 47eefab50..82bfc2e1e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,12 +1,13 @@
 WeeChat ChangeLog
 =================
 Sébastien Helleu <flashcode@flashtux.org>
-v0.3.7-dev, 2011-10-23
+v0.3.7-dev, 2011-10-25
 
 
 Version 0.3.7 (under dev!)
 --------------------------
 
+* core: fix compilation error with "pid_t" on Mac OS X (bug #34639)
 * core: enable background process under Cygwin to connect to servers, fix
   reconnection problem (bug #34626)
 
diff --git a/src/core/wee-hook.h b/src/core/wee-hook.h
index d4c5f8ea7..37edded47 100644
--- a/src/core/wee-hook.h
+++ b/src/core/wee-hook.h
@@ -20,6 +20,8 @@
 #ifndef __WEECHAT_HOOK_H
 #define __WEECHAT_HOOK_H 1
 
+#include <unistd.h>
+
 #ifdef HAVE_GNUTLS
 #include <gnutls/gnutls.h>
 #endif
diff --git a/src/plugins/xfer/xfer.h b/src/plugins/xfer/xfer.h
index 71de5bbf0..8525c8d35 100644
--- a/src/plugins/xfer/xfer.h
+++ b/src/plugins/xfer/xfer.h
@@ -20,6 +20,8 @@
 #ifndef __WEECHAT_XFER_H
 #define __WEECHAT_XFER_H 1
 
+#include <unistd.h>
+
 #define weechat_plugin weechat_xfer_plugin
 #define XFER_PLUGIN_NAME "xfer"