diff --git a/src/main/java/org/hibernate/models/internal/IsResolvedTypeSwitch.java b/src/main/java/org/hibernate/models/internal/IsResolvedTypeSwitch.java
index 1819a0b..ad18a61 100644
--- a/src/main/java/org/hibernate/models/internal/IsResolvedTypeSwitch.java
+++ b/src/main/java/org/hibernate/models/internal/IsResolvedTypeSwitch.java
@@ -8,10 +8,8 @@
 package org.hibernate.models.internal;
 
 import java.util.List;
-import java.util.Objects;
 
 import org.hibernate.models.spi.ArrayTypeDetails;
-import org.hibernate.models.spi.ClassDetails;
 import org.hibernate.models.spi.ClassTypeDetails;
 import org.hibernate.models.spi.ParameterizedTypeDetails;
 import org.hibernate.models.spi.PrimitiveTypeDetails;
@@ -63,7 +61,7 @@ public Boolean caseParameterizedType(
 			SourceModelBuildingContext buildingContext) {
 		final List<TypeDetails> typeArgs = parameterizedType.getArguments();
 		for ( TypeDetails arg : typeArgs ) {
-			if ( !isBound( arg, buildingContext ) ) {
+			if ( !arg.isResolved() ) {
 				return false;
 			}
 		}
diff --git a/src/test/java/org/hibernate/models/annotations/MapKeyTest.java b/src/test/java/org/hibernate/models/annotations/MapKeyTest.java
new file mode 100644
index 0000000..f287264
--- /dev/null
+++ b/src/test/java/org/hibernate/models/annotations/MapKeyTest.java
@@ -0,0 +1,87 @@
+package org.hibernate.models.annotations;
+
+import java.util.Date;
+import java.util.Map;
+
+import org.hibernate.models.SourceModelTestHelper;
+import org.hibernate.models.internal.SourceModelBuildingContextImpl;
+import org.hibernate.models.spi.ClassDetails;
+import org.hibernate.models.spi.FieldDetails;
+import org.hibernate.models.spi.TypeDetails;
+
+import org.junit.jupiter.api.Test;
+
+import org.jboss.jandex.Index;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.MapKeyClass;
+import jakarta.persistence.MapKeyColumn;
+import jakarta.persistence.MapKeyTemporal;
+import jakarta.persistence.OneToMany;
+import jakarta.persistence.TemporalType;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class MapKeyTest {
+
+	@Test
+	void testWithJandex() {
+		final Index index = SourceModelTestHelper.buildJandexIndex(
+				School.class,
+				Person.class
+		);
+		testFieldsAreResolved( index );
+	}
+
+	@Test
+	void testWithoutJandex() {
+		testFieldsAreResolved( null );
+	}
+
+	void testFieldsAreResolved(Index index) {
+		final SourceModelBuildingContextImpl buildingContext = SourceModelTestHelper.createBuildingContext(
+				index,
+				School.class,
+				Person.class
+		);
+
+		final ClassDetails schoolClassDetails = buildingContext.getClassDetailsRegistry().getClassDetails( School.class.getName() );
+
+		final FieldDetails idField = schoolClassDetails.findFieldByName( "id" );
+		final TypeDetails idFieldType = idField.getType();
+		assertThat( idFieldType.isResolved() ).isTrue();
+
+		FieldDetails mapKeyField = schoolClassDetails.findFieldByName( "studentsByDate" );
+		TypeDetails typeDetails = mapKeyField.resolveRelativeType( schoolClassDetails );
+		assertThat( typeDetails.isResolved() ).isTrue();
+
+		FieldDetails mapKeyField2 = schoolClassDetails.findFieldByName( "teachersByDate" );
+		TypeDetails typeDetails2 = mapKeyField2.resolveRelativeType( schoolClassDetails );
+		assertThat( typeDetails2.isResolved() ).isFalse();
+	}
+
+	@Entity
+	public static class School<T> {
+		@Id
+		private int id;
+
+		@OneToMany(mappedBy = "school")
+		@MapKeyClass(Date.class)
+		@MapKeyColumn(name = "THE_DATE")
+		@MapKeyTemporal(TemporalType.DATE)
+		private Map<Object, Person> studentsByDate;
+
+		@OneToMany(mappedBy = "school")
+		@MapKeyClass(Date.class)
+		@MapKeyColumn(name = "THE_DATE")
+		@MapKeyTemporal(TemporalType.DATE)
+		private Map<T, Person> teachersByDate;
+	}
+
+	@Entity
+	public static class Person {
+		@Id
+		private int id;
+	}
+}