diff --git a/distrho/src/DistrhoPluginLV2.cpp b/distrho/src/DistrhoPluginLV2.cpp
index cd76bffe..35ede034 100644
--- a/distrho/src/DistrhoPluginLV2.cpp
+++ b/distrho/src/DistrhoPluginLV2.cpp
@@ -23,6 +23,7 @@
 #include "lv2/instance-access.h"
 #include "lv2/midi.h"
 #include "lv2/options.h"
+#include "lv2/parameters.h"
 #include "lv2/state.h"
 #include "lv2/time.h"
 #include "lv2/urid.h"
@@ -685,7 +686,7 @@ public:
             {
                 if (options[i].type == fURIDs.atomInt)
                 {
-                    const int bufferSize(*(const int*)options[i].value);
+                    const int32_t bufferSize(*(const int32_t*)options[i].value);
                     fPlugin.setBufferSize(bufferSize);
                 }
                 else
@@ -697,7 +698,7 @@ public:
             {
                 if (options[i].type == fURIDs.atomInt)
                 {
-                    const int bufferSize(*(const int*)options[i].value);
+                    const int32_t bufferSize(*(const int32_t*)options[i].value);
                     fPlugin.setBufferSize(bufferSize);
                 }
                 else
@@ -705,11 +706,11 @@ public:
                     d_stderr("Host changed maxBlockLength but with wrong value type");
                 }
             }
-            else if (options[i].key == fUridMap->map(fUridMap->handle, LV2_CORE__sampleRate))
+            else if (options[i].key == fUridMap->map(fUridMap->handle, LV2_PARAMETERS__sampleRate))
             {
-                if (options[i].type == fURIDs.atomDouble)
+                if (options[i].type == fURIDs.atomFloat)
                 {
-                    const double sampleRate(*(const double*)options[i].value);
+                    const float sampleRate(*(const float*)options[i].value);
                     fSampleRate = sampleRate;
                     fPlugin.setSampleRate(sampleRate);
                 }
diff --git a/distrho/src/DistrhoPluginLV2export.cpp b/distrho/src/DistrhoPluginLV2export.cpp
index 961d62bd..295525b5 100644
--- a/distrho/src/DistrhoPluginLV2export.cpp
+++ b/distrho/src/DistrhoPluginLV2export.cpp
@@ -201,6 +201,7 @@ void lv2_generate_ttl(const char* const basename)
 #ifdef DISTRHO_PLUGIN_BRAND
         pluginString += "@prefix mod:  <http://moddevices.com/ns/mod#> .\n";
 #endif
+        pluginString += "@prefix opts: <" LV2_OPTIONS_PREFIX "> .\n";
         pluginString += "@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .\n";
         pluginString += "@prefix rsz:  <" LV2_RESIZE_PORT_PREFIX "> .\n";
 #if DISTRHO_PLUGIN_HAS_UI
@@ -254,6 +255,12 @@ void lv2_generate_ttl(const char* const basename)
 #endif
         pluginString += ";\n\n";
 
+        // supportedOptions
+        pluginString += "    opts:supportedOption <" LV2_BUF_SIZE__nominalBlockLength "> ,\n";
+        pluginString += "                         <" LV2_BUF_SIZE__maxBlockLength "> ,\n";
+        pluginString += "                         <" LV2_PARAMETERS__sampleRate "> ;\n";
+        pluginString += "\n";
+
         // UI
 #if DISTRHO_PLUGIN_HAS_UI
         pluginString += "    ui:ui <" DISTRHO_UI_URI "> ;\n";
@@ -583,8 +590,9 @@ void lv2_generate_ttl(const char* const basename)
         std::fstream uiFile(uiTTL, std::ios::out);
 
         String uiString;
-        uiString += "@prefix lv2: <" LV2_CORE_PREFIX "> .\n";
-        uiString += "@prefix ui:  <" LV2_UI_PREFIX "> .\n";
+        uiString += "@prefix lv2:  <" LV2_CORE_PREFIX "> .\n";
+        uiString += "@prefix ui:   <" LV2_UI_PREFIX "> .\n";
+        uiString += "@prefix opts: <" LV2_OPTIONS_PREFIX "> .\n";
         uiString += "\n";
 
         uiString += "<" DISTRHO_UI_URI ">\n";
@@ -603,7 +611,9 @@ void lv2_generate_ttl(const char* const basename)
         uiString += "\n";
 #  endif
         uiString += "    lv2:requiredFeature <" LV2_OPTIONS__options "> ,\n";
-        uiString += "                        <" LV2_URID__map "> .\n";
+        uiString += "                        <" LV2_URID__map "> ;\n";
+
+        uiString += "    opts:supportedOption <" LV2_PARAMETERS__sampleRate "> .\n";
 
         uiFile << uiString << std::endl;
         uiFile.close();