diff --git a/state_machine_exporter/src/main/java/click/kamil/springstatemachineexporter/ast/common/CodebaseContext.java b/state_machine_exporter/src/main/java/click/kamil/springstatemachineexporter/ast/common/CodebaseContext.java
index 6d6ade7..922091c 100644
--- a/state_machine_exporter/src/main/java/click/kamil/springstatemachineexporter/ast/common/CodebaseContext.java
+++ b/state_machine_exporter/src/main/java/click/kamil/springstatemachineexporter/ast/common/CodebaseContext.java
@@ -482,7 +482,12 @@ public class CodebaseContext {
             }
         }
         enumValues.put(fqn, values);
-        if (!simpleNameToFqn.containsKey(simpleName)) {
+        if (simpleNameToFqn.containsKey(simpleName)) {
+            String existingFqn = simpleNameToFqn.get(simpleName);
+            if (existingFqn != null && !existingFqn.equals(fqn)) {
+                ambiguousSimpleNames.add(simpleName);
+            }
+        } else {
             simpleNameToFqn.put(simpleName, fqn);
         }
 
@@ -516,6 +521,9 @@ public class CodebaseContext {
 
         List<String> values = enumValues.get(cleanName);
         if (values == null) {
+            if (!cleanName.contains(".") && ambiguousSimpleNames.contains(cleanName)) {
+                return null;
+            }
             String fqn = simpleNameToFqn.get(cleanName);
             if (fqn != null) values = enumValues.get(fqn);
         }
diff --git a/state_machine_exporter/src/test/java/click/kamil/springstatemachineexporter/ast/common/CodebaseContextTest.java b/state_machine_exporter/src/test/java/click/kamil/springstatemachineexporter/ast/common/CodebaseContextTest.java
index 5ce5e6d..690faed 100644
--- a/state_machine_exporter/src/test/java/click/kamil/springstatemachineexporter/ast/common/CodebaseContextTest.java
+++ b/state_machine_exporter/src/test/java/click/kamil/springstatemachineexporter/ast/common/CodebaseContextTest.java
@@ -231,6 +231,25 @@ class CodebaseContextTest {
         assertThat(context.findEntryPointClasses(List.of("EnableStateMachine"))).isEmpty();
     }
 
+    @Test
+    void getEnumValuesShouldFailClosedForAmbiguousSimpleEnumName() throws IOException {
+        Files.createDirectories(tempDir.resolve("a"));
+        Files.createDirectories(tempDir.resolve("b"));
+        Files.writeString(tempDir.resolve("a/OrderEvent.java"),
+                "package a; public enum OrderEvent { PAY }");
+        Files.writeString(tempDir.resolve("b/OrderEvent.java"),
+                "package b; public enum OrderEvent { SHIP }");
+
+        CodebaseContext context = new CodebaseContext();
+        context.scan(tempDir);
+
+        assertThat(context.getEnumValues("OrderEvent"))
+                .as("ambiguous simple enum name must not resolve to arbitrary package")
+                .isNull();
+        assertThat(context.getEnumValues("a.OrderEvent")).containsExactly("a.OrderEvent.PAY");
+        assertThat(context.getEnumValues("b.OrderEvent")).containsExactly("b.OrderEvent.SHIP");
+    }
+
     @Test
     void shouldFindClassWithFullyQualifiedAnnotation() throws IOException {
         String source = """