diff --git a/node_modules/@atproto/lexicon/dist/validators/complex.js b/node_modules/@atproto/lexicon/dist/validators/complex.js
index 32d7798..9d688b7 100644
--- a/node_modules/@atproto/lexicon/dist/validators/complex.js
+++ b/node_modules/@atproto/lexicon/dist/validators/complex.js
@@ -113,7 +113,22 @@ function object(lexicons, path, def, value) {
             if (value[key] === null && nullableProps.has(key)) {
                 continue;
             }
-            const propDef = def.properties[key];
+            const propDef = def.properties[key]
+            if (typeof value[key] === 'undefined' && !requiredProps.has(key)) {
+              // Fast path for non-required undefined props.
+              if (
+                propDef.type === 'integer' ||
+                propDef.type === 'boolean' ||
+                propDef.type === 'string'
+              ) {
+                if (typeof propDef.default === 'undefined') {
+                  continue
+                }
+              } else {
+                // Other types have no defaults.
+                continue
+              }
+            }
             const propPath = `${path}/${key}`;
             const validated = (0, util_1.validateOneOf)(lexicons, propPath, propDef, value[key]);
             const propValue = validated.success ? validated.value : value[key];