diff --git a/.changes/unreleased/Fixes-20230906-141819.yaml b/.changes/unreleased/Fixes-20230906-141819.yaml
new file mode 100644
index 000000000..f40944670
--- /dev/null
+++ b/.changes/unreleased/Fixes-20230906-141819.yaml
@@ -0,0 +1,6 @@
+kind: Fixes
+body: Fix bigquery copy materialization
+time: 2023-09-06T14:18:19.445262+02:00
+custom:
+  Author: m-sche
+  Issue: "820"
diff --git a/dbt/include/bigquery/macros/materializations/copy.sql b/dbt/include/bigquery/macros/materializations/copy.sql
index 8285dc845..3ce2de184 100644
--- a/dbt/include/bigquery/macros/materializations/copy.sql
+++ b/dbt/include/bigquery/macros/materializations/copy.sql
@@ -9,7 +9,7 @@
   {# cycle over ref() and source() to create source tables array #}
   {% set source_array = [] %}
   {% for ref_table in model.refs %}
-    {{ source_array.append(ref(*ref_table)) }}
+    {{ source_array.append(ref(ref_table.get('package'), ref_table.name, version=ref_table.get('version'))) }}
   {% endfor %}
 
   {% for src_table in model.sources %}
diff --git a/tests/functional/adapter/test_copy_materialization.py b/tests/functional/adapter/test_copy_materialization.py
new file mode 100644
index 000000000..77d5f4af6
--- /dev/null
+++ b/tests/functional/adapter/test_copy_materialization.py
@@ -0,0 +1,62 @@
+import pytest
+from pathlib import Path
+from dbt.tests.util import run_dbt, write_file, check_relations_equal
+
+_SEED_A = """
+load_date,id,first_name,last_name,email,gender,ip_address
+2021-03-05,1,Jack,Hunter,jhunter0@pbs.org,Male,59.80.20.168
+2021-03-05,2,Kathryn,Walker,kwalker1@ezinearticles.com,Female,194.121.179.35
+2021-03-05,3,Gerald,Ryan,gryan2@com.com,Male,11.3.212.243
+""".lstrip()
+
+_SEED_B = """
+load_date,id,first_name,last_name,email,gender,ip_address
+2021-03-05,4,Bonnie,Spencer,bspencer3@ameblo.jp,Female,216.32.196.175
+2021-03-05,5,Harold,Taylor,htaylor4@people.com.cn,Male,253.10.246.136
+""".lstrip()
+
+_EXPECTED_RESULT = """
+load_date,id,first_name,last_name,email,gender,ip_address
+2021-03-05,1,Jack,Hunter,jhunter0@pbs.org,Male,59.80.20.168
+2021-03-05,2,Kathryn,Walker,kwalker1@ezinearticles.com,Female,194.121.179.35
+2021-03-05,3,Gerald,Ryan,gryan2@com.com,Male,11.3.212.243
+2021-03-05,4,Bonnie,Spencer,bspencer3@ameblo.jp,Female,216.32.196.175
+2021-03-05,5,Harold,Taylor,htaylor4@people.com.cn,Male,253.10.246.136
+""".lstrip()
+
+_COPY_MODEL = """
+{{ config(
+    materialized="copy",
+    copy_materialization="incremental",
+) }}
+
+SELECT * FROM {{ ref("seed") }}
+"""
+
+
+class BaseCopyModelConfig:
+    @pytest.fixture(scope="class")
+    def models(self):
+        return {"copy_model.sql": _COPY_MODEL}
+
+    @pytest.fixture(scope="class")
+    def seeds(self):
+        return {
+            "seed.csv": _SEED_A,
+            "expected_result.csv": _EXPECTED_RESULT,
+        }
+
+
+class TestCopyMaterialization(BaseCopyModelConfig):
+    def test_incremental_copy(self, project):
+        run_dbt(["seed"])
+        run_dbt(["run"])
+
+        # Replace original seed _SEED_A with _SEED_B
+        seed_file = project.project_root / Path("seeds") / Path("seed.csv")
+        write_file(_SEED_B, seed_file)
+
+        run_dbt(["seed"])
+        run_dbt(["run"])
+
+        check_relations_equal(project.adapter, ["copy_model", "expected_result"])