diff --git a/src/connections-glue.c b/src/connections-glue.c
index 117d5499..d38199ee 100644
--- a/src/connections-glue.c
+++ b/src/connections-glue.c
@@ -7,6 +7,7 @@
 #include "http_header.h"
 #include "log.h"
 #include "response.h"
+#include "settings.h"   /* MAX_READ_LIMIT */
 
 #include <stdlib.h>
 #include <string.h>
diff --git a/src/connections.c b/src/connections.c
index 95cb8aef..e41db533 100644
--- a/src/connections.c
+++ b/src/connections.c
@@ -3,7 +3,7 @@
 #include "base.h"
 #include "buffer.h"
 #include "burl.h"       /* HTTP_PARSEOPT_HEADER_STRICT */
-#include "settings.h"   /* BUFFER_MAX_REUSE_SIZE */
+#include "settings.h"   /* BUFFER_MAX_REUSE_SIZE MAX_READ_LIMIT MAX_WRITE_LIMIT */
 #include "log.h"
 #include "connections.h"
 #include "fdevent.h"
diff --git a/src/gw_backend.c b/src/gw_backend.c
index 3f63ca2c..efcd35f4 100644
--- a/src/gw_backend.c
+++ b/src/gw_backend.c
@@ -27,6 +27,7 @@
 #include "fdevent.h"
 #include "log.h"
 #include "sock_addr.h"
+#include "settings.h"   /* MAX_WRITE_LIMIT */
 
 
 
diff --git a/src/http-header-glue.c b/src/http-header-glue.c
index 606648f0..de891406 100644
--- a/src/http-header-glue.c
+++ b/src/http-header-glue.c
@@ -11,6 +11,7 @@
 #include "response.h"
 #include "sock_addr.h"
 #include "stat_cache.h"
+#include "settings.h"   /* MAX_HTTP_REQUEST_HEADER MAX_READ_LIMIT */
 
 #include <stdlib.h>
 #include <string.h>