diff --git a/Zend/zend_execute_API.c b/Zend/zend_execute_API.c
index 6ecfe90b781..7db680089b1 100644
--- a/Zend/zend_execute_API.c
+++ b/Zend/zend_execute_API.c
@@ -893,6 +893,14 @@ ZEND_API int zend_lookup_class(char *name, int name_length, zend_class_entry ***
 		return SUCCESS;
 	}
 
+	/* The compiler is not-reentrant. Make sure we __autoload() only during run-time
+	 * (doesn't impact fuctionality of __autoload()
+	*/
+	if (zend_is_compiling(TSRMLS_C)) {
+		free_alloca(lc_name);
+		return FAILURE;
+	}
+
 	if (EG(in_autoload) == NULL) {
 		ALLOC_HASHTABLE(EG(in_autoload));
 		zend_hash_init(EG(in_autoload), 0, NULL, NULL, 0);	
@@ -903,14 +911,6 @@ ZEND_API int zend_lookup_class(char *name, int name_length, zend_class_entry ***
 		return FAILURE;
 	}
 
-	/* The compiler is not-reentrant. Make sure we __autoload() only during run-time
-	 * (doesn't impact fuctionality of __autoload()
-	 */
-	if (zend_is_compiling(TSRMLS_C)) {
-		free_alloca(lc_name);
-		return FAILURE;
-	}
-
 	ZVAL_STRINGL(&autoload_function, "__autoload", sizeof("__autoload")-1,  0);
 
 	INIT_PZVAL(class_name_ptr);