diff --git a/ext/dl_test/dl_test.stub.php b/ext/dl_test/dl_test.stub.php
index 4f5a445e9837..24ca1d323b41 100644
--- a/ext/dl_test/dl_test.stub.php
+++ b/ext/dl_test/dl_test.stub.php
@@ -20,6 +20,7 @@ public function test(string $str = ""): string {}
 
 class DlTestSuperClass {
     public int $a;
+    public int $temporary = 0;
     public function test(string $str = ""): string {}
 }
 
diff --git a/ext/dl_test/dl_test_arginfo.h b/ext/dl_test/dl_test_arginfo.h
index bd7752211150..323bd1d8028e 100644
--- a/ext/dl_test/dl_test_arginfo.h
+++ b/ext/dl_test/dl_test_arginfo.h
@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: 0ab7bc0f3289a77ecb1850a1cc7056b7c5297fda */
+ * Stub hash: 41b8200735b71e691dc431d7ce34e9e0b9a4a7fd */
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_dl_test_test1, 0, 0, IS_VOID, 0)
 ZEND_END_ARG_INFO()
@@ -69,6 +69,12 @@ static zend_class_entry *register_class_DlTestSuperClass(void)
 	zend_declare_typed_property(class_entry, property_a_name, &property_a_default_value, ZEND_ACC_PUBLIC, NULL, (zend_type) ZEND_TYPE_INIT_MASK(MAY_BE_LONG));
 	zend_string_release(property_a_name);
 
+	zval property_temporary_default_value;
+	ZVAL_LONG(&property_temporary_default_value, 0);
+	zend_string *property_temporary_name = zend_string_init("temporary", sizeof("temporary") - 1, 1);
+	zend_declare_typed_property(class_entry, property_temporary_name, &property_temporary_default_value, ZEND_ACC_PUBLIC, NULL, (zend_type) ZEND_TYPE_INIT_MASK(MAY_BE_LONG));
+	zend_string_release(property_temporary_name);
+
 	return class_entry;
 }
 
diff --git a/ext/dl_test/tests/opcache_temporary_strings.inc b/ext/dl_test/tests/opcache_temporary_strings.inc
new file mode 100644
index 000000000000..2da8426961cd
--- /dev/null
+++ b/ext/dl_test/tests/opcache_temporary_strings.inc
@@ -0,0 +1,16 @@
+<?php
+try {
+    dl_test_test2([]);
+} catch (TypeError $e) {
+    echo $e::class, ": ", $e->getMessage(), PHP_EOL;
+}
+
+try {
+    (new DlTest)->test([]);
+} catch (TypeError $e) {
+    echo $e::class, ": ", $e->getMessage(), PHP_EOL;
+}
+
+var_dump((new ReflectionFunction('dl_test_test2'))->getName());
+
+var_dump(get_object_vars(new DlTestSubClass));
diff --git a/ext/dl_test/tests/opcache_temporary_strings.phpt b/ext/dl_test/tests/opcache_temporary_strings.phpt
new file mode 100644
index 000000000000..e51a2b7247ca
--- /dev/null
+++ b/ext/dl_test/tests/opcache_temporary_strings.phpt
@@ -0,0 +1,22 @@
+--TEST--
+dl() under opcache: refcounting names declared by a temporary module
+--SKIPIF--
+<?php include __DIR__ . "/skip.inc"; ?>
+--EXTENSIONS--
+opcache
+--INI--
+enable_dl=1
+opcache.enable_cli=1
+--FILE--
+<?php
+dl(PHP_OS_FAMILY === 'Windows' ? 'php_dl_test.dll' : 'dl_test.so');
+include __DIR__ . '/opcache_temporary_strings.inc';
+?>
+--EXPECT--
+TypeError: dl_test_test2(): Argument #1 ($str) must be of type string, array given
+TypeError: DlTest::test(): Argument #1 ($str) must be of type string, array given
+string(13) "dl_test_test2"
+array(1) {
+  ["temporary"]=>
+  int(0)
+}
diff --git a/ext/opcache/ZendAccelerator.c b/ext/opcache/ZendAccelerator.c
index 79c7668ba5e9..7d35ef5c147b 100644
--- a/ext/opcache/ZendAccelerator.c
+++ b/ext/opcache/ZendAccelerator.c
@@ -578,6 +578,13 @@ static zend_string* ZEND_FASTCALL accel_new_interned_string_for_php(zend_string
 			return ret;
 		}
 	}
+#if ZEND_RC_DEBUG
+	/* PHP shouldn't create persistent strings during request, but at least
+	 * dl() may do this. They belong to the temporary module and are not shared. */
+	if (!zend_rc_debug && !ZSTR_IS_INTERNED(str) && (GC_FLAGS(str) & GC_PERSISTENT)) {
+		GC_MAKE_PERSISTENT_LOCAL(str);
+	}
+#endif
 	return str;
 }
 
@@ -602,19 +609,31 @@ static zend_always_inline zend_string *accel_find_interned_string_ex(zend_ulong
 
 static zend_string* ZEND_FASTCALL accel_init_interned_string_for_php(const char *str, size_t size, bool permanent)
 {
+	zend_string *ret;
+
 	if (ZCG(counted)) {
 	    zend_ulong h = zend_inline_hash_func(str, size);
-		zend_string *ret = accel_find_interned_string_ex(h, str, size);
+		ret = accel_find_interned_string_ex(h, str, size);
 
-		if (!ret) {
-			ret = zend_string_init(str, size, permanent);
-			ZSTR_H(ret) = h;
+		if (ret) {
+			return ret;
 		}
 
-		return ret;
+		ret = zend_string_init(str, size, permanent);
+		ZSTR_H(ret) = h;
+	} else {
+		ret = zend_string_init(str, size, permanent);
 	}
 
-	return zend_string_init(str, size, permanent);
+#if ZEND_RC_DEBUG
+	/* PHP shouldn't create persistent strings during request, but at least
+	 * dl() may do this. They belong to the temporary module and are not shared. */
+	if (!zend_rc_debug && permanent) {
+		GC_MAKE_PERSISTENT_LOCAL(ret);
+	}
+#endif
+
+	return ret;
 }
 
 static inline void accel_copy_permanent_list_types(