diff --git a/packages/eslint-plugin/src/rules/prefer-optional-chain.ts b/packages/eslint-plugin/src/rules/prefer-optional-chain.ts
index 89eb72094b6..73fbcc27af3 100644
--- a/packages/eslint-plugin/src/rules/prefer-optional-chain.ts
+++ b/packages/eslint-plugin/src/rules/prefer-optional-chain.ts
@@ -400,6 +400,7 @@ export default util.createRule({
 
           case AST_NODE_TYPES.Literal:
           case AST_NODE_TYPES.TemplateLiteral:
+          case AST_NODE_TYPES.BinaryExpression:
             propertyText = sourceCode.getText(node.property);
             break;
 
diff --git a/packages/eslint-plugin/tests/rules/prefer-optional-chain.test.ts b/packages/eslint-plugin/tests/rules/prefer-optional-chain.test.ts
index 58b309edcc8..e1a1467d80f 100644
--- a/packages/eslint-plugin/tests/rules/prefer-optional-chain.test.ts
+++ b/packages/eslint-plugin/tests/rules/prefer-optional-chain.test.ts
@@ -198,6 +198,8 @@ ruleTester.run('prefer-optional-chain', rule, {
     'foo && foo[bar as string] && foo[bar as string].baz;',
     'foo && foo[1 + 2] && foo[1 + 2].baz;',
     'foo && foo[typeof bar] && foo[typeof bar].baz;',
+    '!foo[1 + 1] || !foo[1 + 2];',
+    '!foo[1 + 1] || !foo[1 + 1].foo;',
     '!foo || !foo[bar as string] || !foo[bar as string].baz;',
     '!foo || !foo[1 + 2] || !foo[1 + 2].baz;',
     '!foo || !foo[typeof bar] || !foo[typeof bar].baz;',