diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index 2ae507a..cf763d7 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -331,6 +331,12 @@ secure_raw_write(Port *port, const void *ptr, size_t len)
 {
 	ssize_t		n;
 
+	if (random() < INT_MAX / 4)
+	{
+		errno = EWOULDBLOCK;
+		return -1;
+	}
+
 #ifdef WIN32
 	pgwin32_noblock = true;
 #endif
diff --git a/src/interfaces/libpq/fe-secure.c b/src/interfaces/libpq/fe-secure.c
index 52f6e87..c94587d 100644
--- a/src/interfaces/libpq/fe-secure.c
+++ b/src/interfaces/libpq/fe-secure.c
@@ -27,6 +27,7 @@
 #include <signal.h>
 #include <fcntl.h>
 #include <ctype.h>
+#include <limits.h>
 
 #ifdef WIN32
 #include "win32.h"
@@ -329,6 +330,12 @@ pqsecure_raw_write(PGconn *conn, const void *ptr, size_t len)
 
 	DECLARE_SIGPIPE_INFO(spinfo);
 
+	if (random() < INT_MAX / 2)
+	{
+		SOCK_ERRNO_SET(EWOULDBLOCK);
+		return -1;
+	}
+
 #ifdef MSG_NOSIGNAL
 	if (conn->sigpipe_flag)
 		flags |= MSG_NOSIGNAL;