diff --git a/modules/juce_audio_basics/juce_audio_basics.cpp b/modules/juce_audio_basics/juce_audio_basics.cpp
index 258de8f..c5a6bfa 100644
--- a/modules/juce_audio_basics/juce_audio_basics.cpp
+++ b/modules/juce_audio_basics/juce_audio_basics.cpp
@@ -83,6 +83,7 @@ namespace juce
 #include "buffers/juce_FloatVectorOperations.cpp"
 #include "buffers/juce_AudioChannelSet.cpp"
 #include "effects/juce_IIRFilter.cpp"
+#include "effects/juce_IIRFilterOld.cpp"
 #include "effects/juce_LagrangeInterpolator.cpp"
 #include "effects/juce_CatmullRomInterpolator.cpp"
 #include "midi/juce_MidiBuffer.cpp"
diff --git a/modules/juce_audio_basics/juce_audio_basics.h b/modules/juce_audio_basics/juce_audio_basics.h
index feb2a6e..ce6c8f4 100644
--- a/modules/juce_audio_basics/juce_audio_basics.h
+++ b/modules/juce_audio_basics/juce_audio_basics.h
@@ -63,6 +63,7 @@ namespace juce
 #include "buffers/juce_AudioChannelSet.h"
 #include "effects/juce_Decibels.h"
 #include "effects/juce_IIRFilter.h"
+#include "effects/juce_IIRFilterOld.h"
 #include "effects/juce_LagrangeInterpolator.h"
 #include "effects/juce_CatmullRomInterpolator.h"
 #include "effects/juce_LinearSmoothedValue.h"
