diff --git a/ChangeLog.adoc b/ChangeLog.adoc
index 1bfadf3b1..3124d456b 100644
--- a/ChangeLog.adoc
+++ b/ChangeLog.adoc
@@ -58,6 +58,7 @@ Bug fixes::
   * api: replace plugin and buffer name by buffer pointer in argument "modifier_data" sent to weechat_print modifier callback (issue #42)
   * exec: fix use of same task id for different tasks (issue #1491)
   * fifo: fix errors when writing in the FIFO pipe (issue #713)
+  * irc: do not remove spaces at the end of users messages received (issue #1513)
   * irc: fix realname delimiter color in WHO/WHOX response (issue #1497)
   * irc: reuse a buffer with wrong type "channel" when a private message is received (issue #869)
   * python: fix crash when invalid UTF-8 string is in a WeeChat hashtable converted to a Python dict (issue #1463)
diff --git a/src/plugins/irc/irc-protocol.c b/src/plugins/irc/irc-protocol.c
index a1aa89488..82efb5412 100644
--- a/src/plugins/irc/irc-protocol.c
+++ b/src/plugins/irc/irc-protocol.c
@@ -6691,7 +6691,7 @@ irc_protocol_recv_command (struct t_irc_server *server,
         flags = WEECHAT_STRING_SPLIT_STRIP_LEFT
             | WEECHAT_STRING_SPLIT_COLLAPSE_SEPS
             | WEECHAT_STRING_SPLIT_KEEP_EOL;
-        if (keep_trailing_spaces)
+        if (!keep_trailing_spaces)
             flags |= WEECHAT_STRING_SPLIT_STRIP_RIGHT;
         argv_eol = weechat_string_split (message_colors_decoded, " ", NULL,
                                          flags, 0, NULL);