diff --git a/source/sources/source-mirror.cpp b/source/sources/source-mirror.cpp
index 54c4afd5..dcbdbbc8 100644
--- a/source/sources/source-mirror.cpp
+++ b/source/sources/source-mirror.cpp
@@ -85,12 +85,12 @@ mirror::mirror_instance::~mirror_instance()
 
 uint32_t mirror::mirror_instance::get_width()
 {
-	return obs_source_get_width(_source.get());
+	return _source_size.first;
 }
 
 uint32_t mirror::mirror_instance::get_height()
 {
-	return obs_source_get_height(_source.get());
+	return _source_size.second;
 }
 
 static void convert_config(obs_data_t* data)
@@ -135,7 +135,13 @@ void mirror::mirror_instance::save(obs_data_t* data)
 	}
 }
 
-void mirror::mirror_instance::video_tick(float time) {}
+void mirror::mirror_instance::video_tick(float time)
+{
+	if (_source) {
+		_source_size.first  = obs_source_get_width(_source.get());
+		_source_size.second = obs_source_get_height(_source.get());
+	}
+}
 
 void mirror::mirror_instance::video_render(gs_effect_t* effect)
 {
diff --git a/source/sources/source-mirror.hpp b/source/sources/source-mirror.hpp
index af2c9d34..d16fff2f 100644
--- a/source/sources/source-mirror.hpp
+++ b/source/sources/source-mirror.hpp
@@ -57,6 +57,7 @@ namespace source::mirror {
 		std::shared_ptr<obs::tools::child_source>   _source_child;
 		std::shared_ptr<obs::source_signal_handler> _signal_rename;
 		std::shared_ptr<obs::audio_signal_handler>  _signal_audio;
+		std::pair<uint32_t, uint32_t>               _source_size;
 
 		// Audio
 		bool                          _audio_enabled;