diff --git a/psycopg/libpq_support.h b/psycopg/libpq_support.h
index 77d7ab12..e57fae99 100644
--- a/psycopg/libpq_support.h
+++ b/psycopg/libpq_support.h
@@ -26,10 +26,10 @@
 #define PSYCOPG_LIBPQ_SUPPORT_H 1
 
 #include "psycopg/config.h"
-#include "internal/c.h"
 
-/* type and constant definitions from internal postgres includes not available otherwise */
+/* type and constant definitions from internal postgres include */
 typedef unsigned PG_INT64_TYPE XLogRecPtr;
+typedef uint32_t uint32;
 
 /* have to use lowercase %x, as PyString_FromFormat can't do %X */
 #define XLOGFMTSTR "%x/%x"
diff --git a/psycopg/replication_message_type.c b/psycopg/replication_message_type.c
index 358d1497..b37c402e 100644
--- a/psycopg/replication_message_type.c
+++ b/psycopg/replication_message_type.c
@@ -49,9 +49,10 @@ static PyObject *
 replmsg_repr(replicationMessageObject *self)
 {
     return PyString_FromFormat(
-        "<ReplicationMessage object at %p; data_size: %d; data_start: "XLOGFMTSTR"; wal_end: "XLOGFMTSTR"; send_time: " INT64_FORMAT ">",
+        "<ReplicationMessage object at %p; data_size: %d; "
+        "data_start: "XLOGFMTSTR"; wal_end: "XLOGFMTSTR"; send_time: %ld>",
         self, self->data_size, XLOGFMTARGS(self->data_start), XLOGFMTARGS(self->wal_end),
-        self->send_time);
+        (long int)self->send_time);
 }
 
 static int