diff --git a/src/wp-admin/includes/plugin.php b/src/wp-admin/includes/plugin.php
index 914ef15df2..94d5b856a6 100644
--- a/src/wp-admin/includes/plugin.php
+++ b/src/wp-admin/includes/plugin.php
@@ -658,11 +658,13 @@ function activate_plugin( $plugin, $redirect = '', $network_wide = false, $silen
 		}
 
 		ob_start();
-		wp_register_plugin_realpath( WP_PLUGIN_DIR . '/' . $plugin );
-		$_wp_plugin_file = $plugin;
+
 		if ( ! defined( 'WP_SANDBOX_SCRAPING' ) ) {
 			define( 'WP_SANDBOX_SCRAPING', true );
 		}
+
+		wp_register_plugin_realpath( WP_PLUGIN_DIR . '/' . $plugin );
+		$_wp_plugin_file = $plugin;
 		include_once WP_PLUGIN_DIR . '/' . $plugin;
 		$plugin = $_wp_plugin_file; // Avoid stomping of the $plugin variable in a plugin.
 
@@ -1252,8 +1254,9 @@ function uninstall_plugin( $plugin ) {
 		unset( $uninstallable_plugins );
 
 		define( 'WP_UNINSTALL_PLUGIN', $file );
+
 		wp_register_plugin_realpath( WP_PLUGIN_DIR . '/' . $file );
-		include WP_PLUGIN_DIR . '/' . dirname( $file ) . '/uninstall.php';
+		include_once WP_PLUGIN_DIR . '/' . dirname( $file ) . '/uninstall.php';
 
 		return true;
 	}
@@ -1265,7 +1268,7 @@ function uninstall_plugin( $plugin ) {
 		unset( $uninstallable_plugins );
 
 		wp_register_plugin_realpath( WP_PLUGIN_DIR . '/' . $file );
-		include WP_PLUGIN_DIR . '/' . $file;
+		include_once WP_PLUGIN_DIR . '/' . $file;
 
 		add_action( "uninstall_{$file}", $callable );
 
@@ -2287,6 +2290,7 @@ function plugin_sandbox_scrape( $plugin ) {
 	if ( ! defined( 'WP_SANDBOX_SCRAPING' ) ) {
 		define( 'WP_SANDBOX_SCRAPING', true );
 	}
+
 	wp_register_plugin_realpath( WP_PLUGIN_DIR . '/' . $plugin );
 	include WP_PLUGIN_DIR . '/' . $plugin;
 }