diff --git a/spring-data-jdbc/src/test/java/org/springframework/data/jdbc/core/dialect/JdbcPostgresDialectUnitTests.java b/spring-data-jdbc/src/test/java/org/springframework/data/jdbc/core/dialect/JdbcPostgresDialectUnitTests.java
new file mode 100644
index 00000000..9187fa3c
--- /dev/null
+++ b/spring-data-jdbc/src/test/java/org/springframework/data/jdbc/core/dialect/JdbcPostgresDialectUnitTests.java
@@ -0,0 +1,53 @@
+/*
+ * Copyright 2021 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.data.jdbc.core.dialect;
+
+import static org.assertj.core.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+import org.postgresql.geometric.PGbox;
+import org.postgresql.geometric.PGcircle;
+import org.postgresql.geometric.PGlseg;
+import org.postgresql.geometric.PGpath;
+import org.postgresql.geometric.PGpoint;
+import org.postgresql.geometric.PGpolygon;
+import org.postgresql.util.PGobject;
+
+/**
+ * Unit tests for {@link JdbcPostgresDialect}.
+ *
+ * @author Jens Schauder
+ */
+public class JdbcPostgresDialectUnitTests {
+
+	@Test // GH-1065
+	void pgobjectIsConsideredSimple() {
+		assertThat(JdbcPostgresDialect.INSTANCE.simpleTypes()).contains(PGobject.class);
+	}
+
+	@Test // GH-1065
+	void geometricalTypesAreConsideredSimple() {
+
+		assertThat(JdbcPostgresDialect.INSTANCE.simpleTypes()).contains( //
+				PGpoint.class, //
+				PGbox.class, //
+				PGcircle.class, //
+				org.postgresql.geometric.PGline.class, //
+				PGpath.class, //
+				PGpolygon.class, //
+				PGlseg.class);
+	}
+}
diff --git a/spring-data-relational/src/main/java/org/springframework/data/relational/core/dialect/PostgresDialect.java b/spring-data-relational/src/main/java/org/springframework/data/relational/core/dialect/PostgresDialect.java
index e4385582..578fffdc 100644
--- a/spring-data-relational/src/main/java/org/springframework/data/relational/core/dialect/PostgresDialect.java
+++ b/spring-data-relational/src/main/java/org/springframework/data/relational/core/dialect/PostgresDialect.java
@@ -15,7 +15,7 @@
  */
 package org.springframework.data.relational.core.dialect;
 
-import java.sql.JDBCType;
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.HashSet;
@@ -214,8 +214,19 @@ public class PostgresDialect extends AbstractDialect {
 	 */
 	@Override
 	public Set<Class<?>> simpleTypes() {
+
 		Set<Class<?>> simpleTypes = new HashSet<>();
-		ifClassPresent("org.postgresql.util.PGobject", simpleTypes::add);
+		final List<String> simpleTypeNames = Arrays.asList( //
+				"org.postgresql.util.PGobject", //
+				"org.postgresql.geometric.PGpoint", //
+				"org.postgresql.geometric.PGbox", //
+				"org.postgresql.geometric.PGcircle", //
+				"org.postgresql.geometric.PGline", //
+				"org.postgresql.geometric.PGpath", //
+				"org.postgresql.geometric.PGpolygon", //
+				"org.postgresql.geometric.PGlseg"  //
+		);
+		simpleTypeNames.forEach(name -> ifClassPresent(name, simpleTypes::add));
 		return Collections.unmodifiableSet(simpleTypes);
 	}