diff --git a/src/main/java/com/ezylang/evalex/data/EvaluationValue.java b/src/main/java/com/ezylang/evalex/data/EvaluationValue.java
--- a/src/main/java/com/ezylang/evalex/data/EvaluationValue.java
+++ b/src/main/java/com/ezylang/evalex/data/EvaluationValue.java
@@ -112,6 +112,9 @@ this.value = convertToList((List<?>) value);
     } else if (value instanceof Map) {
       this.dataType = DataType.STRUCTURE;
       this.value = convertMapStructure((Map<?, ?>) value);
+    } else if (value instanceof EvaluationValue) {
+      this.dataType = ((EvaluationValue) value).getDataType();
+      this.value = ((EvaluationValue) value).getValue();
     } else {
       throw new IllegalArgumentException(
           "Unsupported data type '" + value.getClass().getName() + "'");
diff --git a/src/test/java/com/ezylang/evalex/data/EvaluationValueTest.java b/src/test/java/com/ezylang/evalex/data/EvaluationValueTest.java
--- a/src/test/java/com/ezylang/evalex/data/EvaluationValueTest.java
+++ b/src/test/java/com/ezylang/evalex/data/EvaluationValueTest.java
@@ -18,7 +18,10 @@
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
+import com.ezylang.evalex.EvaluationException;
+import com.ezylang.evalex.Expression;
 import com.ezylang.evalex.parser.ASTNode;
+import com.ezylang.evalex.parser.ParseException;
 import com.ezylang.evalex.parser.Token;
 import com.ezylang.evalex.parser.Token.TokenType;
 import java.math.BigDecimal;
@@ -272,6 +275,27 @@ .isEqualByComparingTo("3.9876");
 
     assertThat(new EvaluationValue(3.9876, new MathContext(3)).getNumberValue())
         .isEqualByComparingTo("3.99");
+  }
+
+  @Test
+  void nestedEvaluationValue() {
+    try {
+      EvaluationValue value1 = new EvaluationValue("Hello");
+      EvaluationValue value2 = new EvaluationValue("World");
+
+      Map<String, EvaluationValue> structure = new HashMap<>();
+      structure.put("a", value1);
+      structure.put("b", value2);
+
+      EvaluationValue structureMap = new EvaluationValue(structure);
+
+      Expression exp = new Expression("value.a == \"Hello\"").with("value", structureMap);
+
+      EvaluationValue result = exp.evaluate();
+      assertThat(result.getBooleanValue()).isTrue();
+    } catch (EvaluationException | ParseException e) {
+      e.printStackTrace();
+    }
   }
 
   private void assertDataIsCorrect(