diff --git a/plugins/woocommerce/changelog/pr-43731 b/plugins/woocommerce/changelog/pr-43731
new file mode 100644
index 00000000000..9b574f78d88
--- /dev/null
+++ b/plugins/woocommerce/changelog/pr-43731
@@ -0,0 +1,4 @@
+Significance: patch
+Type: update
+
+Fix wpdb->prepare argument type for coupons query
\ No newline at end of file
diff --git a/plugins/woocommerce/includes/data-stores/class-wc-coupon-data-store-cpt.php b/plugins/woocommerce/includes/data-stores/class-wc-coupon-data-store-cpt.php
index abe9022dfbd..5340c4406a7 100644
--- a/plugins/woocommerce/includes/data-stores/class-wc-coupon-data-store-cpt.php
+++ b/plugins/woocommerce/includes/data-stores/class-wc-coupon-data-store-cpt.php
@@ -441,7 +441,7 @@ class WC_Coupon_Data_Store_CPT extends WC_Data_Store_WP implements WC_Coupon_Dat
 		global $wpdb;
 		$usage_count = $wpdb->get_var(
 			$wpdb->prepare(
-				"SELECT COUNT( meta_id ) FROM {$wpdb->postmeta} WHERE post_id = %d AND meta_key = '_used_by' AND meta_value = %d;",
+				"SELECT COUNT( meta_id ) FROM {$wpdb->postmeta} WHERE post_id = %d AND meta_key = '_used_by' AND meta_value = %s;",
 				$coupon->get_id(),
 				$user_id
 			)