diff --git a/src/audio.cpp b/src/audio.cpp
index fd1baf5..c497095 100644
--- a/src/audio.cpp
+++ b/src/audio.cpp
@@ -59,7 +59,7 @@ void APU::test()
 void APU::setSignalCallback()
 {
 	if (mMap)
-		mMap->connectObserver([this](Word address, Byte value){ this->onWrite(address, value); });
+		mMap->connectObserver([this](Word address, Byte value) { this->onWrite(address, value); });
 }
 
 void APU::writeByte(Word address, Byte value)