diff --git a/c/driver/postgresql/postgres_copy_reader.h b/c/driver/postgresql/postgres_copy_reader.h
index f4faaaef56..bef0fcde8d 100644
--- a/c/driver/postgresql/postgres_copy_reader.h
+++ b/c/driver/postgresql/postgres_copy_reader.h
@@ -1237,6 +1237,7 @@ static inline ArrowErrorCode MakeCopyFieldWriter(const enum ArrowType arrow_type
     case NANOARROW_TYPE_BOOL:
       *out = new PostgresCopyBooleanFieldWriter();
       return NANOARROW_OK;
+    case NANOARROW_TYPE_INT8:
     case NANOARROW_TYPE_INT16:
       *out = new PostgresCopyNetworkEndianFieldWriter<int16_t>();
       return NANOARROW_OK;
diff --git a/c/driver/postgresql/postgres_copy_reader_test.cc b/c/driver/postgresql/postgres_copy_reader_test.cc
index f2db5b7698..76b56ef514 100644
--- a/c/driver/postgresql/postgres_copy_reader_test.cc
+++ b/c/driver/postgresql/postgres_copy_reader_test.cc
@@ -197,6 +197,30 @@ TEST(PostgresCopyUtilsTest, PostgresCopyReadSmallInt) {
   ASSERT_EQ(data_buffer[4], 0);
 }
 
+TEST(PostgresCopyUtilsTest, PostgresCopyWriteInt8) {
+  adbc_validation::Handle<struct ArrowSchema> schema;
+  adbc_validation::Handle<struct ArrowArray> array;
+  struct ArrowError na_error;
+  ASSERT_EQ(adbc_validation::MakeSchema(&schema.value, {{"col", NANOARROW_TYPE_INT8}}),
+            ADBC_STATUS_OK);
+  ASSERT_EQ(adbc_validation::MakeBatch<int8_t>(&schema.value, &array.value, &na_error,
+                                                {-123, -1, 1, 123, std::nullopt}),
+            ADBC_STATUS_OK);
+
+  PostgresCopyStreamWriteTester tester;
+  ASSERT_EQ(tester.Init(&schema.value, &array.value), NANOARROW_OK);
+  ASSERT_EQ(tester.WriteAll(nullptr), ENODATA);
+
+  const struct ArrowBuffer buf = tester.WriteBuffer();
+  // The last 2 bytes of a message can be transmitted via PQputCopyData
+  // so no need to test those bytes from the Writer
+  constexpr size_t buf_size = sizeof(kTestPgCopySmallInt) - 2;
+  ASSERT_EQ(buf.size_bytes, buf_size);
+  for (size_t i = 0; i < buf_size; i++) {
+    ASSERT_EQ(buf.data[i], kTestPgCopySmallInt[i]);
+  }
+}
+
 TEST(PostgresCopyUtilsTest, PostgresCopyWriteInt16) {
   adbc_validation::Handle<struct ArrowSchema> schema;
   adbc_validation::Handle<struct ArrowArray> array;