diff --git a/mapstruct/src/main/java/com/baeldung/expression/mapper/LicenseMapper.java b/mapstruct/src/main/java/com/baeldung/expression/mapper/LicenseMapper.java
index 100588b45d..8bfcd8b14b 100644
--- a/mapstruct/src/main/java/com/baeldung/expression/mapper/LicenseMapper.java
+++ b/mapstruct/src/main/java/com/baeldung/expression/mapper/LicenseMapper.java
@@ -4,6 +4,7 @@ import java.time.Duration;
 import java.time.LocalDateTime;
 import java.time.OffsetDateTime;
 import java.time.ZoneOffset;
+import java.util.UUID;
 
 import org.mapstruct.AfterMapping;
 import org.mapstruct.Mapper;
@@ -20,6 +21,7 @@ public interface LicenseMapper {
     @Mapping(target = "endDate", ignore = true)
     @Mapping(target = "active", constant = "true")
     @Mapping(target = "renewalRequired", conditionExpression = "java(isEndDateInTwoWeeks(licenseDto))", source = ".")
+    @Mapping(target = "id", expression = "java(setId())")
     License toLicense(LicenseDto licenseDto);
 
     @AfterMapping
@@ -40,4 +42,8 @@ public interface LicenseMapper {
             .toDays() <= 14;
     }
 
+    default UUID setId() {
+        return UUID.randomUUID();
+    }
+
 }
diff --git a/mapstruct/src/test/java/com/baeldung/expression/mapper/LicenseMapperUnitTest.java b/mapstruct/src/test/java/com/baeldung/expression/mapper/LicenseMapperUnitTest.java
index 73be63561b..d6ecd87802 100644
--- a/mapstruct/src/test/java/com/baeldung/expression/mapper/LicenseMapperUnitTest.java
+++ b/mapstruct/src/test/java/com/baeldung/expression/mapper/LicenseMapperUnitTest.java
@@ -21,6 +21,7 @@ class LicenseMapperUnitTest {
         licenseDto.setStartDate(LocalDateTime.now());
         License license = licenseMapper.toLicense(licenseDto);
         assertThat(license).isNotNull();
+        assertThat(license.getId()).isNotNull();
         assertThat(license.getEndDate()
             .toLocalDate()).isEqualTo(LocalDate.now()
             .plusYears(1));
@@ -33,6 +34,7 @@ class LicenseMapperUnitTest {
             .plusYears(2));
         License license = licenseMapper.toLicense(licenseDto);
         assertThat(license).isNotNull();
+        assertThat(license.getId()).isNotNull();
         assertThat(license.getStartDate()
             .toLocalDate()).isEqualTo(LocalDate.now());
     }
@@ -42,6 +44,7 @@ class LicenseMapperUnitTest {
         LicenseDto licenseDto = new LicenseDto();
         License license = licenseMapper.toLicense(licenseDto);
         assertThat(license).isNotNull();
+        assertThat(license.getId()).isNotNull();
         assertThat(license.getStartDate()
             .toLocalDate()).isEqualTo(LocalDate.now());
         assertThat(license.getEndDate()
@@ -58,6 +61,7 @@ class LicenseMapperUnitTest {
             .plusDays(10));
         License license = licenseMapper.toLicense(licenseDto);
         assertThat(license).isNotNull();
+        assertThat(license.getId()).isNotNull();
         assertThat(license.isRenewalRequired()).isTrue();
     }