diff --git a/sapi/phpdbg/phpdbg.c b/sapi/phpdbg/phpdbg.c
index 3aa0b7b60d7e..d9cc8f5e891e 100644
--- a/sapi/phpdbg/phpdbg.c
+++ b/sapi/phpdbg/phpdbg.c
@@ -845,7 +845,7 @@ static void php_sapi_phpdbg_register_vars(zval *track_vars_array) /* {{{ */
 
 static inline size_t php_sapi_phpdbg_ub_write(const char *message, size_t length) /* {{{ */
 {
-	return phpdbg_script(P_STDOUT, "%.*s", (int) length, message);
+	return phpdbg_process_print(PHPDBG_G(io)[PHPDBG_STDOUT].fd, P_STDOUT, message, (int) length);
 } /* }}} */
 
 /* beginning of struct, see main/streams/plain_wrapper.c line 111 */
diff --git a/sapi/phpdbg/phpdbg_out.c b/sapi/phpdbg/phpdbg_out.c
index af2f3b98d2ba..63b61fb8eab0 100644
--- a/sapi/phpdbg/phpdbg_out.c
+++ b/sapi/phpdbg/phpdbg_out.c
@@ -40,7 +40,7 @@ PHPDBG_API int _phpdbg_asprintf(char **buf, const char *format, ...) {
 	return ret;
 }
 
-static int phpdbg_process_print(int fd, int type, const char *msg, int msglen) {
+int phpdbg_process_print(int fd, int type, const char *msg, int msglen) {
 	char *msgout = NULL;
 	int msgoutlen = FAILURE;
 
diff --git a/sapi/phpdbg/phpdbg_out.h b/sapi/phpdbg/phpdbg_out.h
index 828e147a1b7e..1a54bb7ec284 100644
--- a/sapi/phpdbg/phpdbg_out.h
+++ b/sapi/phpdbg/phpdbg_out.h
@@ -59,6 +59,8 @@ PHPDBG_API void phpdbg_free_err_buf(void);
 PHPDBG_API void phpdbg_activate_err_buf(bool active);
 PHPDBG_API int phpdbg_output_err_buf(const char *strfmt, ...);
 
+int phpdbg_process_print(int fd, int type, const char *msg, int msglen);
+
 
 /* {{{ For separation */
 #define SEPARATE "------------------------------------------------" /* }}} */
diff --git a/sapi/phpdbg/tests/gh10715.phpt b/sapi/phpdbg/tests/gh10715.phpt
index 13edd9afdd8f..63d98cae1073 100644
Binary files a/sapi/phpdbg/tests/gh10715.phpt and b/sapi/phpdbg/tests/gh10715.phpt differ
diff --git a/sapi/phpdbg/tests/gh14553.phpt b/sapi/phpdbg/tests/gh14553.phpt
new file mode 100644
index 000000000000..bcf61c0a9fb4
--- /dev/null
+++ b/sapi/phpdbg/tests/gh14553.phpt
@@ -0,0 +1,14 @@
+--TEST--
+GH-14553 (Bug in phpdbg8.3 (also 8.1 and 8.2) echo output - trimmed at NULL byte (?))
+--PHPDBG--
+r
+q
+--FILE--
+<?php
+echo "hello\0world";
+?>
+--EXPECTF--
+[Successful compilation of %s]
+prompt> hello%0world
+[Script ended normally]
+prompt>