diff --git a/esphome/components/web_server/web_server.h b/esphome/components/web_server/web_server.h
index d11b53dc60e..c05748192f5 100644
--- a/esphome/components/web_server/web_server.h
+++ b/esphome/components/web_server/web_server.h
@@ -113,10 +113,10 @@ class DeferredUpdateEventSource : public AsyncEventSource {
   /*
     This class holds a pointer to the source component that wants to publish a state event, and a pointer to a function
     that will lazily generate that event.  The two pointers allow dedup in the deferred queue if multiple publishes for
-    the same component are backed up, and take up only 8 bytes of memory.  The entry in the deferred queue (a
-    std::vector) is the DeferredEvent instance itself (not a pointer to one elsewhere in heap) so still only 8 bytes per
-    entry (and no heap fragmentation).  Even 100 backed up events (you'd have to have at least 100 sensors publishing
-    because of dedup) would take up only 0.8 kB.
+    the same component are backed up, and take up only two pointers of memory.  The entry in the deferred queue (a
+    std::vector) is the DeferredEvent instance itself (not a pointer to one elsewhere in heap) so still only two
+    pointers per entry (and no heap fragmentation).  Even 100 backed up events (you'd have to have at least 100 sensors
+    publishing because of dedup) would take up only 0.8 kB.
   */
   struct DeferredEvent {
     friend class DeferredUpdateEventSource;
@@ -132,6 +132,8 @@ class DeferredUpdateEventSource : public AsyncEventSource {
       return (source_ == test.source_ && message_generator_ == test.message_generator_);
     }
   };
+  static_assert(sizeof(DeferredEvent) == sizeof(void *) + sizeof(message_generator_t *),
+                "DeferredEvent should have no padding");
 
  protected:
   // surface a couple methods from the base class
diff --git a/esphome/components/web_server_idf/web_server_idf.h b/esphome/components/web_server_idf/web_server_idf.h
index f213a5c3dd9..b657731cb61 100644
--- a/esphome/components/web_server_idf/web_server_idf.h
+++ b/esphome/components/web_server_idf/web_server_idf.h
@@ -260,9 +260,9 @@ using message_generator_t = json::SerializationBuffer<>(esphome::web_server::Web
 /*
   This class holds a pointer to the source component that wants to publish a state event, and a pointer to a function
   that will lazily generate that event.  The two pointers allow dedup in the deferred queue if multiple publishes for
-  the same component are backed up, and take up only 8 bytes of memory.  The entry in the deferred queue (a
-  std::vector) is the DeferredEvent instance itself (not a pointer to one elsewhere in heap) so still only 8 bytes per
-  entry (and no heap fragmentation).  Even 100 backed up events (you'd have to have at least 100 sensors publishing
+  the same component are backed up, and take up only two pointers of memory.  The entry in the deferred queue (a
+  std::vector) is the DeferredEvent instance itself (not a pointer to one elsewhere in heap) so still only two pointers
+  per entry (and no heap fragmentation).  Even 100 backed up events (you'd have to have at least 100 sensors publishing
   because of dedup) would take up only 0.8 kB.
 */
 struct DeferredEvent {
@@ -279,6 +279,8 @@ struct DeferredEvent {
     return (source_ == test.source_ && message_generator_ == test.message_generator_);
   }
 };
+static_assert(sizeof(DeferredEvent) == sizeof(void *) + sizeof(message_generator_t *),
+              "DeferredEvent should have no padding");
 
 class AsyncEventSourceResponse {
   friend class AsyncEventSource;