diff --git a/ext/spl/spl_fixedarray.c b/ext/spl/spl_fixedarray.c
index bceaf2be93daf..255cc7457690f 100644
--- a/ext/spl/spl_fixedarray.c
+++ b/ext/spl/spl_fixedarray.c
@@ -43,6 +43,8 @@ ZEND_GET_MODULE(spl_fixedarray)
 typedef struct _spl_fixedarray { /* {{{ */
 	zend_long size;
 	zval *elements;
+	unsigned int is_resizing:1;
+	unsigned int reserved:31;
 } spl_fixedarray;
 /* }}} */
 
@@ -88,6 +90,7 @@ static void spl_fixedarray_init(spl_fixedarray *array, zend_long size) /* {{{ */
 		array->elements = NULL;
 		array->size = 0;
 	}
+	array->is_resizing = 0;
 }
 /* }}} */
 
@@ -104,6 +107,8 @@ static void spl_fixedarray_resize(spl_fixedarray *array, zend_long size) /* {{{
 		return;
 	}
 
+	array->is_resizing = 1;
+
 	/* clearing the array */
 	if (size == 0) {
 		zend_long i;
@@ -129,6 +134,7 @@ static void spl_fixedarray_resize(spl_fixedarray *array, zend_long size) /* {{{
 	}
 
 	array->size = size;
+	array->is_resizing = 0;
 }
 /* }}} */
 
@@ -738,6 +744,11 @@ SPL_METHOD(SplFixedArray, setSize)
 
 	intern = Z_SPLFIXEDARRAY_P(object);
 
+	if (intern->array.is_resizing) {
+		zend_throw_exception_ex(spl_ce_LogicException, 0, "recursive resize is not allowed");
+		return;
+	}
+
 	spl_fixedarray_resize(&intern->array, size);
 	RETURN_TRUE;
 }
diff --git a/ext/spl/tests/bug80663.phpt b/ext/spl/tests/bug80663.phpt
new file mode 100644
index 0000000000000..049dc0e908c96
--- /dev/null
+++ b/ext/spl/tests/bug80663.phpt
@@ -0,0 +1,20 @@
+--TEST--
+Bug #80663 (Recursive SplFixedArray::setSize() may cause double-free)
+--FILE--
+<?php
+class InvalidDestructor {
+    public function __destruct() {
+        try {
+            $GLOBALS['obj']->setSize(0);
+        } catch (LogicException $ex) {
+            echo $ex->getMessage();
+        }
+    }
+}
+
+$obj = new SplFixedArray(1000);
+$obj[0] = new InvalidDestructor();
+$obj->setSize(0);
+?>
+--EXPECT--
+recursive resize is not allowed