diff --git a/modules/swagger-parser/src/main/java/io/swagger/parser/processors/ExternalRefProcessor.java b/modules/swagger-parser/src/main/java/io/swagger/parser/processors/ExternalRefProcessor.java
index 7b349a9be1..7b9a655c96 100644
--- a/modules/swagger-parser/src/main/java/io/swagger/parser/processors/ExternalRefProcessor.java
+++ b/modules/swagger-parser/src/main/java/io/swagger/parser/processors/ExternalRefProcessor.java
@@ -116,6 +116,29 @@ public String processRefToExternalDefinition(String $ref, RefFormat refFormat) {
                     }
                 }
             }
+            if (model instanceof  ModelImpl) {
+                ModelImpl modelImpl = (ModelImpl) model;
+                Property additionalProperties = modelImpl.getAdditionalProperties();
+                if (additionalProperties != null) {
+                    if (additionalProperties instanceof RefProperty) {
+                        processRefProperty(((RefProperty) additionalProperties), file);
+                    } else if (additionalProperties instanceof ArrayProperty) {
+                        ArrayProperty arrayProp = (ArrayProperty) additionalProperties;
+                        if (arrayProp.getItems() instanceof RefProperty) {
+                            processRefProperty((RefProperty) arrayProp.getItems(), file);
+                        }
+                    } else if (additionalProperties instanceof MapProperty) {
+                        MapProperty mapProp = (MapProperty) additionalProperties;
+                        if (mapProp.getAdditionalProperties() instanceof RefProperty) {
+                            processRefProperty((RefProperty) mapProp.getAdditionalProperties(), file);
+                        } else if (mapProp.getAdditionalProperties() instanceof ArrayProperty &&
+                                ((ArrayProperty) mapProp.getAdditionalProperties()).getItems() instanceof RefProperty) {
+                            processRefProperty((RefProperty) ((ArrayProperty) mapProp.getAdditionalProperties()).getItems(), file);
+                        }
+                    }
+
+                }
+            }
             if (model instanceof ArrayModel && ((ArrayModel) model).getItems() instanceof RefProperty) {
                 processRefProperty((RefProperty) ((ArrayModel) model).getItems(), file);
             }
diff --git a/modules/swagger-parser/src/test/java/io/swagger/parser/SwaggerParserTest.java b/modules/swagger-parser/src/test/java/io/swagger/parser/SwaggerParserTest.java
index 0b3509a475..6a16d9a627 100644
--- a/modules/swagger-parser/src/test/java/io/swagger/parser/SwaggerParserTest.java
+++ b/modules/swagger-parser/src/test/java/io/swagger/parser/SwaggerParserTest.java
@@ -50,6 +50,7 @@
 import static org.testng.Assert.fail;
 
 public class SwaggerParserTest {
+
     @Test
     public void testModelParameters() throws Exception {
         String yaml = "swagger: '2.0'\n" +
@@ -1026,4 +1027,20 @@ public void testRefNameConflicts() throws Exception {
         assertEquals("local", swagger.getDefinitions().get("PersonObj").getProperties().get("location").getExample());
         assertEquals("referred", swagger.getDefinitions().get("PersonObj_2").getProperties().get("location").getExample());
     }
+
+    @Test
+    public void testRefAdditionalProperties() throws Exception {
+        Swagger swagger = new SwaggerParser().read("src/test/resources/additionalProperties.yaml");
+
+        Assert.assertNotNull(swagger);
+
+        Assert.assertTrue(swagger.getDefinitions().size() == 3);
+        
+        Assert.assertNotNull(swagger.getDefinitions().get("link-object"));
+        Assert.assertNotNull(swagger.getDefinitions().get("rel-data"));
+        Assert.assertNotNull(swagger.getDefinitions().get("result"));
+    }
+
+
+
 }
\ No newline at end of file
diff --git a/modules/swagger-parser/src/test/resources/additionalProperties.yaml b/modules/swagger-parser/src/test/resources/additionalProperties.yaml
new file mode 100644
index 0000000000..fb35e7d349
--- /dev/null
+++ b/modules/swagger-parser/src/test/resources/additionalProperties.yaml
@@ -0,0 +1,22 @@
+swagger: "2.0"
+info:
+  title: Test API
+  version: 1.0.0
+host: swagger.io
+basePath: /show-bug
+schemes:
+- http
+produces:
+- application/json
+consumes:
+- application/json
+
+paths:
+  /tests:
+    get:
+      operationId: listTests
+      responses:
+        200:
+          description: Returns results.
+          schema:
+              $ref: "./globals.yaml#/definitions/result"
\ No newline at end of file
diff --git a/modules/swagger-parser/src/test/resources/globals.yaml b/modules/swagger-parser/src/test/resources/globals.yaml
new file mode 100644
index 0000000000..ef301b8337
--- /dev/null
+++ b/modules/swagger-parser/src/test/resources/globals.yaml
@@ -0,0 +1,23 @@
+definitions:
+  link-object:
+    type: object
+    additionalProperties:
+      $ref: '#/definitions/rel-data'
+
+  rel-data:
+    type: object
+    required:
+      - href
+    properties:
+      href:
+        type: string
+      note:
+        type: string
+
+  result:
+    type: object
+    properties:
+      name:
+        type: string
+      _links:
+        $ref: "#/definitions/link-object"
\ No newline at end of file