diff --git a/includes/api/class-wc-api-authentication.php b/includes/api/class-wc-api-authentication.php
index 22ed5eebd95..d3a6c6d2a5f 100644
--- a/includes/api/class-wc-api-authentication.php
+++ b/includes/api/class-wc-api-authentication.php
@@ -184,6 +184,15 @@ class WC_API_Authentication {
 		$consumer_signature = rawurldecode( $params['oauth_signature'] );
 		unset( $params['oauth_signature'] );
 
+		// remove filters and convert them from array to strings to void normalize issues
+		if ( isset( $params['filter'] ) ) {
+			$filters = $params['filter'];
+			unset( $params['filter'] );
+			foreach ( $filters as $filter => $filter_value ) {
+				$params['filter[' . $filter . ']'] = $filter_value;
+			}
+		}
+
 		// normalize parameter key/values
 		array_walk( $params, array( $this, 'normalize_parameters' ) );