diff --git a/features/plugin.feature b/features/plugin.feature
index 879f1e89..cacaa996 100644
--- a/features/plugin.feature
+++ b/features/plugin.feature
@@ -298,6 +298,44 @@ Feature: Manage WordPress plugins
       """
     And the return code should be 0
 
+  @require-wp-5.2
+  Scenario: Network activate all plugins when some are already active on a single site
+    Given a WP multisite install
+    And I run `wp plugin delete --all`
+
+    When I run `wp plugin install debug-bar`
+    And I run `wp plugin install wordpress-importer --activate`
+    Then STDOUT should contain:
+      """
+      Plugin 'wordpress-importer' activated.
+      """
+
+    When I run `wp plugin list --fields=name,status`
+    Then STDOUT should be a table containing rows:
+      | name                | status |
+      | debug-bar           | inactive |
+      | wordpress-importer  | active |
+
+    When I run `wp plugin activate --all --network`
+    Then STDOUT should contain:
+      """
+      Plugin 'debug-bar' network activated.
+      """
+    And STDOUT should contain:
+      """
+      Plugin 'wordpress-importer' network activated.
+      """
+    And STDOUT should contain:
+      """
+      Success: Network activated 2 of 2 plugins.
+      """
+
+    When I run `wp plugin list --fields=name,status`
+    Then STDOUT should be a table containing rows:
+      | name                | status         |
+      | debug-bar           | active-network |
+      | wordpress-importer  | active-network |
+
   Scenario: List plugins
     Given a WP install
 
diff --git a/src/Plugin_Command.php b/src/Plugin_Command.php
index ae04e702..587c6d25 100644
--- a/src/Plugin_Command.php
+++ b/src/Plugin_Command.php
@@ -383,7 +383,9 @@ public function activate( $args, $assoc_args = [] ) {
 		}
 		foreach ( $plugins as $plugin ) {
 			$status = $this->get_status( $plugin->file );
-			if ( $all && ! $force && in_array( $status, [ 'active', 'active-network' ], true ) ) {
+			// When using --all flag, skip plugins that are already in the target state.
+			$skip_statuses = $network_wide ? array( 'active-network' ) : array( 'active', 'active-network' );
+			if ( $all && ! $force && in_array( $status, $skip_statuses, true ) ) {
 				continue;
 			}
 			// Network-active is the highest level of activation status.