diff --git a/ext/spl/php_spl.c b/ext/spl/php_spl.c
index dda04cbd017..2e34f46e640 100755
--- a/ext/spl/php_spl.c
+++ b/ext/spl/php_spl.c
@@ -415,6 +415,7 @@ PHP_FUNCTION(spl_autoload_call)
 	(ht)->pListTail->pListNext = (ht)->pListHead;			\
 	(ht)->pListHead = (ht)->pListTail;						\
 	(ht)->pListTail = (ht)->pListHead->pListLast;			\
+	(ht)->pListHead->pListNext->pListLast = (ht)->pListHead;\
 	(ht)->pListTail->pListNext = NULL;						\
 	(ht)->pListHead->pListLast = NULL;
 
diff --git a/ext/spl/tests/bug48493.phpt b/ext/spl/tests/bug48493.phpt
new file mode 100644
index 00000000000..d0be7f8ec71
--- /dev/null
+++ b/ext/spl/tests/bug48493.phpt
@@ -0,0 +1,26 @@
+--TEST--
+SPL: Bug #48493 spl_autoload_unregister() can't handle prepended functions
+--FILE--
+<?php
+function autoload1() {}
+
+function autoload2() {}
+
+spl_autoload_register('autoload2');
+spl_autoload_register('autoload1', true, true);
+var_dump(spl_autoload_functions());
+
+spl_autoload_unregister('autoload2');
+var_dump(spl_autoload_functions());
+?>
+--EXPECT--
+array(2) {
+  [0]=>
+  string(9) "autoload1"
+  [1]=>
+  string(9) "autoload2"
+}
+array(1) {
+  [0]=>
+  string(9) "autoload1"
+}