diff --git a/src/PluginHost.cpp b/src/PluginHost.cpp
index 2fd40fd..3fa4ef3 100644
--- a/src/PluginHost.cpp
+++ b/src/PluginHost.cpp
@@ -209,6 +209,13 @@ void PluginHost::LilvUris::Initialize(LilvWorld *pWorld)
 
     mod__fileTypes = lilv_new_uri(pWorld, "http://moddevices.com/ns/mod#fileTypes");
     mod__supportedExtensions = lilv_new_uri(pWorld, "http://moddevices.com/ns/mod#supportedExtensions");
+
+    buf_size__minBlockLength = lilv_new_uri(pWorld, LV2_BUF_SIZE__minBlockLength);
+    buf_size__maxBlockLength = lilv_new_uri(pWorld, LV2_BUF_SIZE__maxBlockLength);
+    buf_size__fixedBlockLength = lilv_new_uri(pWorld, LV2_BUF_SIZE__fixedBlockLength);
+    buf_size__coarseBlockLength = lilv_new_uri(pWorld, LV2_BUF_SIZE__coarseBlockLength);
+
+
 }
 
 void PluginHost::LilvUris::Free()
diff --git a/src/PluginHost.hpp b/src/PluginHost.hpp
index a1a46c5..d90a9e3 100644
--- a/src/PluginHost.hpp
+++ b/src/PluginHost.hpp
@@ -850,6 +850,12 @@ namespace pipedal
             AutoLilvNode mod__supportedExtensions;
             AutoLilvNode pipedalui__fileTypes;
 
+            AutoLilvNode buf_size__minBlockLength;
+            AutoLilvNode buf_size__maxBlockLength;
+            AutoLilvNode buf_size__fixedBlockLength;
+            AutoLilvNode buf_size__coarseBlockLength;
+
+
             
         };
         LilvUris* lilvUris = nullptr;