diff --git a/Zend/zend_compile.c b/Zend/zend_compile.c
index 0669d106f15e9..7afa220ee08e4 100644
--- a/Zend/zend_compile.c
+++ b/Zend/zend_compile.c
@@ -8462,6 +8462,15 @@ static zend_op_array *zend_compile_func_decl_ex(
 	/* Pop the loop variable stack separator */
 	zend_stack_del_top(&CG(loop_var_stack));
 
+	if (op_array->fn_flags & ZEND_ACC_CLOSURE) {
+		/* Set the closure scope at compile time as an optimization to
+		 * prevent creating a separate runtime cache for every initialization
+		 * of this closure. Most closures are expected not to change their
+		 * scope in practice.
+		 */
+		op_array->scope = CG(active_class_entry);
+	}
+
 	if (level == FUNC_DECL_LEVEL_TOPLEVEL) {
 		zend_observer_function_declared_notify(op_array, lcname);
 	}
diff --git a/ext/zend_test/tests/observer_closure_04.phpt b/ext/zend_test/tests/observer_closure_04.phpt
new file mode 100644
index 0000000000000..2178bc578d4d2
--- /dev/null
+++ b/ext/zend_test/tests/observer_closure_04.phpt
@@ -0,0 +1,126 @@
+--TEST--
+Observer: Closures keep their runtime cache when not rebinding
+--EXTENSIONS--
+zend_test
+--INI--
+zend_test.observer.enabled=1
+zend_test.observer.show_output=1
+zend_test.observer.observe_all=1
+--FILE--
+<?php
+
+class Foo {
+  private static $value = "x";
+  function static() {
+    (static function () {
+      echo Foo::$value, PHP_EOL;
+    })();
+  }
+  function non_static() {
+    (function () {
+      echo Foo::$value, PHP_EOL;
+    })();
+  }
+  function rebind() {
+    ((function () {
+      try {
+        echo Foo::$value, PHP_EOL;
+      } catch (Error $e) {
+        echo $e::class, ": ", $e->getMessage(), PHP_EOL;
+      }
+    })->bindTo(null, null))();
+  }
+}
+
+$obj = new Foo();
+$obj->static();
+$obj->static();
+$obj->non_static();
+$obj->non_static();
+$obj->rebind();
+$obj->rebind();
+
+$closure = function () {
+  echo Foo::$value, PHP_EOL;
+};
+
+($closure->bindTo(null, Foo::class))();
+($closure->bindTo(null, Foo::class))();
+
+$boundClosure = $closure->bindTo(null, Foo::class);
+$boundClosure();
+$boundClosure();
+
+?>
+--EXPECTF--
+<!-- init '%s' -->
+<file '%s'>
+  <!-- init Foo::static() -->
+  <Foo::static>
+    <!-- init Foo::{closure:Foo::static():6}() -->
+    <Foo::{closure:Foo::static():6}>
+x
+    </Foo::{closure:Foo::static():6}>
+  </Foo::static>
+  <Foo::static>
+    <Foo::{closure:Foo::static():6}>
+x
+    </Foo::{closure:Foo::static():6}>
+  </Foo::static>
+  <!-- init Foo::non_static() -->
+  <Foo::non_static>
+    <!-- init Foo::{closure:Foo::non_static():11}() -->
+    <Foo::{closure:Foo::non_static():11}>
+x
+    </Foo::{closure:Foo::non_static():11}>
+  </Foo::non_static>
+  <Foo::non_static>
+    <Foo::{closure:Foo::non_static():11}>
+x
+    </Foo::{closure:Foo::non_static():11}>
+  </Foo::non_static>
+  <!-- init Foo::rebind() -->
+  <Foo::rebind>
+    <!-- init Closure::bindTo() -->
+    <Closure::bindTo>
+    </Closure::bindTo>
+    <!-- init {closure:Foo::rebind():16}() -->
+    <{closure:Foo::rebind():16}>
+Error:       <!-- init Error::getMessage() -->
+      <Error::getMessage>
+      </Error::getMessage>
+Cannot access private property Foo::$value
+    </{closure:Foo::rebind():16}>
+  </Foo::rebind>
+  <Foo::rebind>
+    <Closure::bindTo>
+    </Closure::bindTo>
+    <!-- init {closure:Foo::rebind():16}() -->
+    <{closure:Foo::rebind():16}>
+Error:       <Error::getMessage>
+      </Error::getMessage>
+Cannot access private property Foo::$value
+    </{closure:Foo::rebind():16}>
+  </Foo::rebind>
+  <Closure::bindTo>
+  </Closure::bindTo>
+  <!-- init Foo::{closure:%s:%d}() -->
+  <Foo::{closure:%s:%d}>
+x
+  </Foo::{closure:%s:%d}>
+  <Closure::bindTo>
+  </Closure::bindTo>
+  <!-- init Foo::{closure:%s:%d}() -->
+  <Foo::{closure:%s:%d}>
+x
+  </Foo::{closure:%s:%d}>
+  <Closure::bindTo>
+  </Closure::bindTo>
+  <!-- init Foo::{closure:%s:%d}() -->
+  <Foo::{closure:%s:%d}>
+x
+  </Foo::{closure:%s:%d}>
+  <Foo::{closure:%s:%d}>
+x
+  </Foo::{closure:%s:%d}>
+</file '%s'>