diff --git a/ext/soap/php_http.c b/ext/soap/php_http.c
index ae99c8077c3..60e8044a825 100644
--- a/ext/soap/php_http.c
+++ b/ext/soap/php_http.c
@@ -748,7 +748,7 @@ try_again:
 					PHP_MD5Update(&md5ctx, (unsigned char*)":", 1);
 					PHP_MD5Update(&md5ctx, (unsigned char*)cnonce, 8);
 					PHP_MD5Update(&md5ctx, (unsigned char*)":", 1);
-					/* TODO: Support for qop="auth-int" */
+					/* TODO: Support for qop=auth-int */
 					PHP_MD5Update(&md5ctx, (unsigned char*)"auth", sizeof("auth")-1);
 					PHP_MD5Update(&md5ctx, (unsigned char*)":", 1);
 				}
@@ -784,11 +784,11 @@ try_again:
 				}
 				if ((tmp = zend_hash_str_find(Z_ARRVAL_P(digest), "qop", sizeof("qop")-1)) != NULL &&
 					Z_TYPE_P(tmp) == IS_STRING) {
-				/* TODO: Support for qop="auth-int" */
-					smart_str_append_const(&soap_headers, "\", qop=\"auth");
-					smart_str_append_const(&soap_headers, "\", nc=\"");
+					/* TODO: Support for qop=auth-int */
+					smart_str_append_const(&soap_headers, "\", qop=auth");
+					smart_str_append_const(&soap_headers, ", nc=");
 					smart_str_appendl(&soap_headers, nc, 8);
-					smart_str_append_const(&soap_headers, "\", cnonce=\"");
+					smart_str_append_const(&soap_headers, ", cnonce=\"");
 					smart_str_appendl(&soap_headers, cnonce, 8);
 				}
 				smart_str_append_const(&soap_headers, "\", response=\"");
diff --git a/ext/soap/tests/bugs/bug55639.phpt b/ext/soap/tests/bugs/bug55639.phpt
new file mode 100644
index 00000000000..16d7f7a3771
--- /dev/null
+++ b/ext/soap/tests/bugs/bug55639.phpt
@@ -0,0 +1,65 @@
+--TEST--
+Bug #55639 (Digest authentication dont work)
+--INI--
+soap.wsdl_cache_enabled=0
+--EXTENSIONS--
+soap
+--SKIPIF--
+<?php
+if (!file_exists(__DIR__ . "/../../../../sapi/cli/tests/php_cli_server.inc")) {
+    echo "skip sapi/cli/tests/php_cli_server.inc required but not found";
+}
+?>
+--FILE--
+<?php
+
+include __DIR__ . "/../../../../sapi/cli/tests/php_cli_server.inc";
+
+$args = ["-d", "extension_dir=" . ini_get("extension_dir"), "-d", "extension=" . (substr(PHP_OS, 0, 3) == "WIN" ? "php_" : "") . "soap." . PHP_SHLIB_SUFFIX];
+if (php_ini_loaded_file()) {
+  // Necessary such that it works from a development directory in which case extension_dir might not be the real extension dir
+  $args[] = "-c";
+  $args[] = php_ini_loaded_file();
+}
+
+$code = <<<'PHP'
+/* Receive */
+header('HTTP/1.0 401 Unauthorized');
+header('WWW-Authenticate: Digest realm="realm", qop="auth,auth-int", nonce="aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", opaque="bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"');
+file_get_contents("php://input");
+PHP;
+
+php_cli_server_start($code, null, $args);
+
+$client = new soapclient(NULL, [
+  'location' => 'http://' . PHP_CLI_SERVER_ADDRESS,
+  'uri' => 'misc-uri',
+  'authentication' => SOAP_AUTHENTICATION_DIGEST,
+  'realm' => 'myrealm',
+  'login' => 'user',
+  'password' => 'pass',
+  'trace' => true,
+]);
+
+try {
+    $client->__soapCall("foo", []);
+} catch (Throwable $e) {
+    echo $e->getMessage(), "\n";
+}
+
+$headers = $client->__getLastRequestHeaders();
+var_dump($headers);
+
+?>
+--EXPECTF--
+Unauthorized
+string(%d) "POST / HTTP/1.1
+Host: %s
+Connection: Keep-Alive
+User-Agent: %s
+Content-Type: text/xml; charset=utf-8
+SOAPAction: "misc-uri#foo"
+Content-Length: %d
+Authorization: Digest username="user", realm="realm", nonce="aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", uri="/", qop=auth, nc=00000001, cnonce="%s", response="%s", opaque="bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"
+
+"