diff --git a/modules/juce_audio_devices/native/juce_ios_Audio.cpp b/modules/juce_audio_devices/native/juce_ios_Audio.cpp
index a5a1b313b7..f20ea444f2 100644
--- a/modules/juce_audio_devices/native/juce_ios_Audio.cpp
+++ b/modules/juce_audio_devices/native/juce_ios_Audio.cpp
@@ -122,7 +122,7 @@ public:
         setSessionFloat64Property (kAudioSessionProperty_PreferredHardwareSampleRate, targetSampleRate);
         updateSampleRates();
 
-        setSessionFloat64Property (kAudioSessionProperty_PreferredHardwareIOBufferDuration, preferredBufferSize / sampleRate);
+        setSessionFloat32Property (kAudioSessionProperty_PreferredHardwareIOBufferDuration, preferredBufferSize / sampleRate);
         updateCurrentBufferSize();
 
         prepareFloatBuffers (actualBufferSize);
@@ -553,6 +553,7 @@ private:
     }
 
     static void setSessionUInt32Property  (AudioSessionPropertyID propID, UInt32  v) noexcept  { AudioSessionSetProperty (propID, sizeof (v), &v); }
+    static void setSessionFloat32Property (AudioSessionPropertyID propID, Float32 v) noexcept  { AudioSessionSetProperty (propID, sizeof (v), &v); }
     static void setSessionFloat64Property (AudioSessionPropertyID propID, Float64 v) noexcept  { AudioSessionSetProperty (propID, sizeof (v), &v); }
 
     JUCE_DECLARE_NON_COPYABLE (iOSAudioIODevice)