diff --git a/build/transforms.json b/build/transforms.json
index 0ab8462..36826a1 100644
--- a/build/transforms.json
+++ b/build/transforms.json
@@ -738,6 +738,18 @@
         "type": "fixture",
         "version": "6"
       },
+      {
+        "input": "can-observable-object/observable-object-static-properties-input.js",
+        "outputPath": "can-observable-object/observable-object-static-properties-input.js",
+        "type": "fixture",
+        "version": "6"
+      },
+      {
+        "input": "can-observable-object/observable-object-static-properties-output.js",
+        "outputPath": "can-observable-object/observable-object-static-properties-output.js",
+        "type": "fixture",
+        "version": "6"
+      },
       {
         "input": "can-observable-object/observable-object-test.js",
         "outputPath": "can-observable-object/observable-object-test.js",
diff --git a/src/templates/can-observable-object/observable-object-static-properties-input.js b/src/templates/can-observable-object/observable-object-static-properties-input.js
new file mode 100644
index 0000000..bc27088
--- /dev/null
+++ b/src/templates/can-observable-object/observable-object-static-properties-input.js
@@ -0,0 +1,11 @@
+const Todo = DefineMap.extend('Foo', { bar: 'Bar', seal: true}, {
+  foo: "number"
+});
+
+const MyTodo = DefineMap.extend({ bar: 'Bar', seal: false}, {
+  foo: "number"
+});
+
+const MyOtherTodo = DefineMap.extend('Foo', {
+  foo: "number"
+});
diff --git a/src/templates/can-observable-object/observable-object-static-properties-output.js b/src/templates/can-observable-object/observable-object-static-properties-output.js
new file mode 100644
index 0000000..ca2e36e
--- /dev/null
+++ b/src/templates/can-observable-object/observable-object-static-properties-output.js
@@ -0,0 +1,23 @@
+class Todo extends ObservableObject {
+  static get props() {
+    return {
+      foo: "number"
+    };
+  }
+}
+
+class MyTodo extends ObservableObject {
+  static get props() {
+    return {
+      foo: "number"
+    };
+  }
+}
+
+class MyOtherTodo extends ObservableObject {
+  static get props() {
+    return {
+      foo: "number"
+    };
+  }
+}
diff --git a/src/templates/can-observable-object/observable-object-test.js b/src/templates/can-observable-object/observable-object-test.js
index 11dbe37..1672314 100644
--- a/src/templates/can-observable-object/observable-object-test.js
+++ b/src/templates/can-observable-object/observable-object-test.js
@@ -29,4 +29,11 @@ describe('can-observable-object/observable-object', function() {
     utils.diffFiles(fn, inputPath, outputPath);
   });
 
+  it('Handles DefineMap static propeties to ObservableObject static properties', function() {
+    const fn = require(toTest.file);
+    const inputPath = `fixtures/version-6/${toTest.fileName.replace('.js', '-static-properties-input.js')}`;
+    const outputPath = `fixtures/version-6/${toTest.fileName.replace('.js', '-static-properties-output.js')}`;
+    utils.diffFiles(fn, inputPath, outputPath);
+  });
+
 });
diff --git a/src/utils/defineTransform.js b/src/utils/defineTransform.js
index 5d07728..89d2c95 100644
--- a/src/utils/defineTransform.js
+++ b/src/utils/defineTransform.js
@@ -64,9 +64,18 @@ export default function defineTransform ({
       classPath = path;
     }
 
-    let propDefinitionsArg = path.value.arguments.length === 1 ?
-      path.value.arguments[0] :
-      path.value.arguments[1];
+    let propDefinitionsArg;
+
+    if (path.value.arguments.length === 3) {
+      // Handle DefineMap.extend('Foo', {//staticProps}, {protoProps})
+      propDefinitionsArg = path.value.arguments[2];
+    }  else if (path.value.arguments.length === 2) {
+      // Handle DefineMap.extend({//staticProps}, {protoProps})
+      propDefinitionsArg = path.value.arguments[1];
+    } else if (path.value.arguments.length === 1) {
+      // Handle DefineMap.extend({protoProps})
+      propDefinitionsArg = path.value.arguments[0];
+    }
 
     // Check if we have an existing varDeclaration
     // if so let's create a new name to prevent clashing
@@ -84,18 +93,20 @@ export default function defineTransform ({
 
     debug(`Replacing ${varDeclaration} with ${extendedClassName} class`);
 
+    let body = [
+      createMethod({
+        j,
+        method: false, // Want this to be a getter
+        name: 'props',
+        blockStatement: [j.returnStatement(propDefinitionsArg)],
+        isStatic: true
+      })
+    ];
+
     const classDeclaration = createClass({
       j,
       className: varDeclaration ? varDeclaration : '',
-      body: [
-        createMethod({
-          j,
-          method: false, // Want this to be a getter
-          name: 'props',
-          blockStatement: [j.returnStatement(propDefinitionsArg)],
-          isStatic: true
-        })
-      ],
+      body: body,
       extendedClassName
     });
 
diff --git a/test/fixtures/version-6/can-observable-object/observable-object-static-properties-input.js b/test/fixtures/version-6/can-observable-object/observable-object-static-properties-input.js
new file mode 100644
index 0000000..bc27088
--- /dev/null
+++ b/test/fixtures/version-6/can-observable-object/observable-object-static-properties-input.js
@@ -0,0 +1,11 @@
+const Todo = DefineMap.extend('Foo', { bar: 'Bar', seal: true}, {
+  foo: "number"
+});
+
+const MyTodo = DefineMap.extend({ bar: 'Bar', seal: false}, {
+  foo: "number"
+});
+
+const MyOtherTodo = DefineMap.extend('Foo', {
+  foo: "number"
+});
diff --git a/test/fixtures/version-6/can-observable-object/observable-object-static-properties-output.js b/test/fixtures/version-6/can-observable-object/observable-object-static-properties-output.js
new file mode 100644
index 0000000..ca2e36e
--- /dev/null
+++ b/test/fixtures/version-6/can-observable-object/observable-object-static-properties-output.js
@@ -0,0 +1,23 @@
+class Todo extends ObservableObject {
+  static get props() {
+    return {
+      foo: "number"
+    };
+  }
+}
+
+class MyTodo extends ObservableObject {
+  static get props() {
+    return {
+      foo: "number"
+    };
+  }
+}
+
+class MyOtherTodo extends ObservableObject {
+  static get props() {
+    return {
+      foo: "number"
+    };
+  }
+}