diff --git a/spring-jdbc/src/main/java/org/springframework/jdbc/core/ColumnMapRowMapper.java b/spring-jdbc/src/main/java/org/springframework/jdbc/core/ColumnMapRowMapper.java
index f5674e43d3d6..7f35ac4e868e 100644
--- a/spring-jdbc/src/main/java/org/springframework/jdbc/core/ColumnMapRowMapper.java
+++ b/spring-jdbc/src/main/java/org/springframework/jdbc/core/ColumnMapRowMapper.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2018 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.
@@ -56,7 +56,7 @@ public Map<String, Object> mapRow(ResultSet rs, int rowNum) throws SQLException
 		for (int i = 1; i <= columnCount; i++) {
 			String key = getColumnKey(JdbcUtils.lookupColumnName(rsmd, i));
 			Object obj = getColumnValue(rs, i);
-			mapOfColValues.put(key, obj);
+			mapOfColValues.putIfAbsent(key, obj);
 		}
 		return mapOfColValues;
 	}
diff --git a/spring-jdbc/src/test/java/org/springframework/jdbc/core/ColumnMapRowMapperTests.java b/spring-jdbc/src/test/java/org/springframework/jdbc/core/ColumnMapRowMapperTests.java
new file mode 100644
index 000000000000..7e3bfa304c7a
--- /dev/null
+++ b/spring-jdbc/src/test/java/org/springframework/jdbc/core/ColumnMapRowMapperTests.java
@@ -0,0 +1,57 @@
+/*
+ * Copyright 2002-2018 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
+ *
+ *      http://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.jdbc.core;
+
+import java.sql.ResultSet;
+import java.sql.ResultSetMetaData;
+import java.sql.SQLException;
+import java.util.Map;
+
+import org.junit.Test;
+
+import static org.mockito.BDDMockito.*;
+import static org.junit.Assert.*;
+
+/**
+ * Tests for {@link ColumnMapRowMapper}.
+ *
+ * @author Philippe Marschall
+ * @since 5.0.5
+ */
+public class ColumnMapRowMapperTests {
+
+	@Test
+	public void returnValueOfFirstEquallyNamedColumn() throws SQLException {
+
+		ColumnMapRowMapper rowMapper = new ColumnMapRowMapper();
+
+		ResultSet resultSet = mock(ResultSet.class);
+		ResultSetMetaData metaData = mock(ResultSetMetaData.class);
+		given(metaData.getColumnCount()).willReturn(2);
+		given(metaData.getColumnLabel(1)).willReturn("x");
+		given(metaData.getColumnLabel(2)).willReturn("X");
+		given(resultSet.getMetaData()).willReturn(metaData);
+		given(resultSet.getObject(1)).willReturn("first value");
+		given(resultSet.getObject(2)).willReturn("second value");
+
+		Map<String, Object> map = rowMapper.mapRow(resultSet, 0);
+		assertEquals(1, map.size());
+		assertEquals(map.get("x"), "first value");
+
+	}
+
+}