diff --git a/src/wp-includes/taxonomy.php b/src/wp-includes/taxonomy.php
index e910e33cc5..82d16ae1e2 100644
--- a/src/wp-includes/taxonomy.php
+++ b/src/wp-includes/taxonomy.php
@@ -1183,15 +1183,19 @@ function get_terms( $args = array(), $deprecated = '' ) {
 	 * (a) a second non-empty parameter is passed, or
 	 * (b) the first parameter shares no keys with the default array (ie, it's a list of taxonomies)
 	 */
-	$key_intersect  = array_intersect_key( $term_query->query_var_defaults, (array) $args );
+	$_args = wp_parse_args( $args );
+	$key_intersect  = array_intersect_key( $term_query->query_var_defaults, (array) $_args );
 	$do_legacy_args = $deprecated || empty( $key_intersect );
 
 	if ( $do_legacy_args ) {
 		$taxonomies = (array) $args;
-		$args = $deprecated;
+		$args = wp_parse_args( $deprecated );
 		$args['taxonomy'] = $taxonomies;
-	} elseif ( isset( $args['taxonomy'] ) && null !== $args['taxonomy'] ) {
-		$args['taxonomy'] = (array) $args['taxonomy'];
+	} else {
+		$args = wp_parse_args( $args );
+		if ( isset( $args['taxonomy'] ) && null !== $args['taxonomy'] ) {
+			$args['taxonomy'] = (array) $args['taxonomy'];
+		}
 	}
 
 	$empty_array = array();
diff --git a/tests/phpunit/tests/term/getTerms.php b/tests/phpunit/tests/term/getTerms.php
index 47e199be48..891c5365eb 100644
--- a/tests/phpunit/tests/term/getTerms.php
+++ b/tests/phpunit/tests/term/getTerms.php
@@ -28,6 +28,32 @@ class Tests_Term_getTerms extends WP_UnitTestCase {
 		$this->assertEqualSets( array( $term ), $found );
 	}
 
+	/**
+	 * @ticket 35495
+	 * @ticket 35381
+	 */
+	public function test_legacy_params_as_query_string_should_be_properly_parsed() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		$term = self::factory()->term->create( array( 'taxonomy' => 'wptests_tax' ) );
+
+		$found = get_terms( 'wptests_tax', 'hide_empty=0&fields=ids&update_term_meta_cache=0' );
+
+		$this->assertEqualSets( array( $term ), $found );
+	}
+
+	/**
+	 * @ticket 35495
+	 * @ticket 35381
+	 */
+	public function test_new_params_as_query_string_should_be_properly_parsed() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		$term = self::factory()->term->create( array( 'taxonomy' => 'wptests_tax' ) );
+
+		$found = get_terms( 'taxonomy=wptests_tax&hide_empty=0&fields=ids&update_term_meta_cache=0' );
+
+		$this->assertEqualSets( array( $term ), $found );
+	}
+
 	/**
 	 * @ticket 35495
 	 */