diff --git a/plugins/Makefile b/plugins/Makefile
index 3f6cdcd..d61043f 100644
--- a/plugins/Makefile
+++ b/plugins/Makefile
@@ -610,6 +610,8 @@ MINIPLUGIN_FILES += BogaudioModules/src/dsp/noise.cpp
 MINIPLUGIN_FILES += BogaudioModules/src/dsp/oscillator.cpp
 MINIPLUGIN_FILES += BogaudioModules/src/dsp/signal.cpp
 MINIPLUGIN_FILES += BogaudioModules/src/dsp/table.cpp
+MINIPLUGIN_FILES += BogaudioModules/src/dsp/filters/experiments.cpp
+MINIPLUGIN_FILES += BogaudioModules/src/dsp/filters/filter.cpp
 MINIPLUGIN_FILES += BogaudioModules/src/dsp/filters/multimode.cpp
 MINIPLUGIN_FILES += BogaudioModules/src/dsp/filters/resample.cpp
 
diff --git a/src/PluginContext.hpp b/src/PluginContext.hpp
index 43c22d8..1217c69 100644
--- a/src/PluginContext.hpp
+++ b/src/PluginContext.hpp
@@ -53,6 +53,8 @@ enum CardinalVariant {
     kCardinalVariantSynth,
 };
 
+class UI;
+
 // -----------------------------------------------------------------------------------------------------------
 
 struct CardinalPluginContext : rack::Context {