diff --git a/docs/c-api/mg_net.h/struct_mg_connection.md b/docs/c-api/mg_net.h/struct_mg_connection.md
index 7a549885..6f888b8d 100644
--- a/docs/c-api/mg_net.h/struct_mg_connection.md
+++ b/docs/c-api/mg_net.h/struct_mg_connection.md
@@ -61,6 +61,8 @@ signature: |
   
   #if MG_ENABLE_SSL
     void *ssl_if_data; /* SSL library data. */
+  #else
+    void *unused_ssl_if_data; /* To keep the size of the structure the same. */
   #endif
   };
 ---
diff --git a/mongoose.h b/mongoose.h
index 6dfc2425..2930d230 100644
--- a/mongoose.h
+++ b/mongoose.h
@@ -3635,6 +3635,8 @@ struct mg_connection {
 
 #if MG_ENABLE_SSL
   void *ssl_if_data; /* SSL library data. */
+#else
+  void *unused_ssl_if_data; /* To keep the size of the structure the same. */
 #endif
 };
 
diff --git a/src/mg_net.h b/src/mg_net.h
index 00378882..1ea9cdde 100644
--- a/src/mg_net.h
+++ b/src/mg_net.h
@@ -155,6 +155,8 @@ struct mg_connection {
 
 #if MG_ENABLE_SSL
   void *ssl_if_data; /* SSL library data. */
+#else
+  void *unused_ssl_if_data; /* To keep the size of the structure the same. */
 #endif
 };