diff --git a/src/detail/vst3/process.cpp b/src/detail/vst3/process.cpp
index c0763ecb..e401d9b1 100644
--- a/src/detail/vst3/process.cpp
+++ b/src/detail/vst3/process.cpp
@@ -39,8 +39,8 @@ namespace Clap
       _silent_output = new float[numSamples];
     }
 
-    auto numInputs = _audioinputs->size();
-    auto numOutputs = _audiooutputs->size();
+    auto numInputs = (uint32_t)_audioinputs->size();
+    auto numOutputs = (uint32_t)_audiooutputs->size();
 
     _processData.audio_inputs_count = numInputs;
     delete[] _input_ports;
@@ -412,7 +412,7 @@ namespace Clap
   uint32_t ProcessAdapter::input_events_size(const struct clap_input_events* list)
   {
     auto self = static_cast<ProcessAdapter*>(list->ctx);
-    return self->_events.size();
+    return (uint32_t)self->_events.size();
     // return self->_vstdata->inputEvents->getEventCount();
   }
 
diff --git a/src/detail/vst3/state.h b/src/detail/vst3/state.h
index 7a5e4c3d..4bb18f3c 100644
--- a/src/detail/vst3/state.h
+++ b/src/detail/vst3/state.h
@@ -23,7 +23,7 @@ class CLAPVST3StreamAdapter
   {
     auto self = static_cast<CLAPVST3StreamAdapter*>(stream->ctx);
     Steinberg::int32 bytesRead = 0;
-    if (kResultOk == self->vst_stream->read(buffer, size, &bytesRead))
+    if (kResultOk == self->vst_stream->read(buffer, (int32)size, &bytesRead))
       return bytesRead;
     return -1;
   }
@@ -31,7 +31,7 @@ class CLAPVST3StreamAdapter
   {
     auto self = static_cast<CLAPVST3StreamAdapter*>(stream->ctx);
     Steinberg::int32 bytesWritten = 0;
-    if (kResultOk == self->vst_stream->write(const_cast<void*>(buffer), size, &bytesWritten))
+    if (kResultOk == self->vst_stream->write(const_cast<void*>(buffer), (int32)size, &bytesWritten))
       return bytesWritten;
     return -1;
   }