diff --git a/src/Hooks/WooMetaboxes.php b/src/Hooks/WooMetaboxes.php
index 52c7048..63dd17f 100644
--- a/src/Hooks/WooMetaboxes.php
+++ b/src/Hooks/WooMetaboxes.php
@@ -111,17 +111,15 @@ public function save_product_meta(
 	): void {
 		// As the hook seems to be run twice for some reason, this should
 		// prevent the function to run twice during the same HTTP request.
-		global $nineteen_eighty_four_woo_dk_meta_update_has_run;
-		if ( isset( $nineteen_eighty_four_woo_dk_meta_update_has_run ) ) {
+		if ( defined( '1984_DK_WOO_META_UPDATE_HAS_RUN' ) ) {
 			return;
 		}
 
+		define( '1984_DK_WOO_META_UPDATE_HAS_RUN', true );
+
 		self::set_product_sync_meta_from_post( $wc_product, 'price' );
 		self::set_product_sync_meta_from_post( $wc_product, 'stock' );
 		self::set_product_sync_meta_from_post( $wc_product, 'name' );
-
-		$nineteen_eighty_four_woo_dk_meta_update_has_run = true;
-		global $nineteen_eighty_four_woo_dk_meta_update_has_run;
 	}
 
 	/**
diff --git a/src/Hooks/WooUpdateProduct.php b/src/Hooks/WooUpdateProduct.php
index e2ad497..50b7afb 100644
--- a/src/Hooks/WooUpdateProduct.php
+++ b/src/Hooks/WooUpdateProduct.php
@@ -64,7 +64,7 @@ public static function on_product_update(
 			return;
 		}
 
-		if ( defined( 'DOING_DK_SYNC' ) ) {
+		if ( defined( '1984_DK_WOO_DOING_SYNC' ) ) {
 			return;
 		}
 
@@ -104,7 +104,7 @@ public static function before_post_delete( int $post_id ): void {
 			return;
 		}
 
-		if ( defined( 'DOING_DK_SYNC' ) ) {
+		if ( defined( '1984_DK_WOO_DOING_SYNC' ) ) {
 			return;
 		}
 
@@ -156,7 +156,7 @@ public static function post_status_change(
 			return;
 		}
 
-		if ( defined( 'DOING_DK_SYNC' ) ) {
+		if ( defined( '1984_DK_WOO_DOING_SYNC' ) ) {
 			return;
 		}
 
diff --git a/src/Import/Currencies.php b/src/Import/Currencies.php
index 35a5d00..d6a7b62 100644
--- a/src/Import/Currencies.php
+++ b/src/Import/Currencies.php
@@ -22,11 +22,11 @@ class Currencies {
 	 * Fetches all the currency rates from DK
 	 */
 	public static function save_all_from_dk(): void {
-		if ( defined( 'DOING_DK_SYNC' ) ) {
+		if ( defined( '1984_DK_WOO_DOING_SYNC' ) ) {
 			return;
 		}
 
-		define( 'DOING_DK_SYNC', true );
+		define( '1984_DK_WOO_DOING_SYNC', true );
 
 		$json_objects = self::get_all_from_dk();
 
diff --git a/src/Import/Products.php b/src/Import/Products.php
index 9d794fc..9841468 100644
--- a/src/Import/Products.php
+++ b/src/Import/Products.php
@@ -44,8 +44,8 @@ class Products {
 	 * This should be run at least nightly as a wp-cron job.
 	 */
 	public static function save_all_from_dk(): void {
-		if ( ! defined( 'DOING_DK_SYNC' ) ) {
-			define( 'DOING_DK_SYNC', true );
+		if ( ! defined( '1984_DK_WOO_DOING_SYNC' ) ) {
+			define( '1984_DK_WOO_DOING_SYNC', true );
 		}
 
 		$json_objects = self::get_all_from_dk();