diff --git a/packages/eslint-plugin/src/rules/member-ordering.ts b/packages/eslint-plugin/src/rules/member-ordering.ts
index 0b60f754d2d..23c2742502b 100644
--- a/packages/eslint-plugin/src/rules/member-ordering.ts
+++ b/packages/eslint-plugin/src/rules/member-ordering.ts
@@ -182,6 +182,9 @@ export default util.createRule<Options, MessageIds>({
       node: TSESTree.ClassElement | TSESTree.TypeElement,
     ): string | null {
       // TODO: add missing TSCallSignatureDeclaration
+      // TODO: add missing TSIndexSignature
+      // TODO: add missing TSAbstractClassProperty
+      // TODO: add missing TSAbstractMethodDefinition
       switch (node.type) {
         case AST_NODE_TYPES.MethodDefinition:
           return node.kind;
@@ -258,7 +261,7 @@ export default util.createRule<Options, MessageIds>({
       const type = getNodeType(node);
       if (type === null) {
         // shouldn't happen but just in case, put it on the end
-        return Number.MAX_SAFE_INTEGER;
+        return order.length - 1;
       }
 
       const scope = 'static' in node && node.static ? 'static' : 'instance';
diff --git a/packages/eslint-plugin/tests/rules/member-ordering.test.ts b/packages/eslint-plugin/tests/rules/member-ordering.test.ts
index 91495e728e6..81e67999b8d 100644
--- a/packages/eslint-plugin/tests/rules/member-ordering.test.ts
+++ b/packages/eslint-plugin/tests/rules/member-ordering.test.ts
@@ -1211,6 +1211,12 @@ type Foo = {
             `,
       options: [{ default: ['method', 'constructor', 'field'] }],
     },
+    `
+abstract class Foo {
+    B: string;
+    abstract A: () => {}
+}
+    `,
   ],
   invalid: [
     {
@@ -3310,5 +3316,24 @@ type Foo = {
         },
       ],
     },
+    {
+      code: `
+abstract class Foo {
+    abstract A: () => {}
+    B: string;
+}
+          `,
+      errors: [
+        {
+          messageId: 'incorrectOrder',
+          data: {
+            name: 'B',
+            rank: 'method',
+          },
+          line: 4,
+          column: 5,
+        },
+      ],
+    },
   ],
 });