diff --git a/src/libs/audio.cpp b/src/libs/audio.cpp
index 5af755acb..05d50e25b 100644
--- a/src/libs/audio.cpp
+++ b/src/libs/audio.cpp
@@ -841,6 +841,12 @@ struct AudioOutPortState {
 	uint64_t reserved2[2];
 };
 
+struct AudioOutSystemState {
+	float    loudness;
+	uint8_t  reserved8[4];
+	uint64_t reserved64[3];
+};
+
 int KYTY_SYSV_ABI AudioOutInit() {
 	PRINT_NAME();
 
@@ -952,6 +958,19 @@ int KYTY_SYSV_ABI AudioOutGetPortState(int handle, AudioOutPortState* state) {
 	return OK;
 }
 
+int KYTY_SYSV_ABI AudioOutGetSystemState(AudioOutSystemState* state) {
+	PRINT_NAME();
+
+	if (state == nullptr) {
+		return AUDIO_OUT_ERROR_INVALID_POINTER;
+	}
+
+	// Loudness is undefined until measurement starts; no measurement is emulated.
+	*state = {};
+
+	return OK;
+}
+
 int KYTY_SYSV_ABI AudioOutSetVolume(int handle, uint32_t flag, int* vol) {
 	PRINT_NAME();
 
diff --git a/src/libs/audio.h b/src/libs/audio.h
index 40706f5ff..fd4a2e636 100644
--- a/src/libs/audio.h
+++ b/src/libs/audio.h
@@ -18,6 +18,7 @@ namespace AudioOut {
 
 struct AudioOutOutputParam;
 struct AudioOutPortState;
+struct AudioOutSystemState;
 
 int KYTY_SYSV_ABI AudioOutInit();
 int KYTY_SYSV_ABI AudioOutOpen(int user_id, int type, int index, uint32_t len, uint32_t freq,
@@ -27,6 +28,7 @@ int KYTY_SYSV_ABI AudioOutOutputs(AudioOutOutputParam* param, uint32_t num);
 int KYTY_SYSV_ABI AudioOutOutput(int handle, const void* ptr);
 int KYTY_SYSV_ABI AudioOutClose(int handle);
 int KYTY_SYSV_ABI AudioOutGetPortState(int handle, AudioOutPortState* state);
+int KYTY_SYSV_ABI AudioOutGetSystemState(AudioOutSystemState* state);
 
 } // namespace AudioOut
 
diff --git a/src/libs/libAudio.cpp b/src/libs/libAudio.cpp
index 2069a82b6..0827e7028 100644
--- a/src/libs/libAudio.cpp
+++ b/src/libs/libAudio.cpp
@@ -131,6 +131,7 @@ LIB_DEFINE(InitAudio_1_AudioOut) {
 	LIB_FUNC("QOQtbeDqsT4", AudioOut::AudioOutOutput);
 	LIB_FUNC("s1--uE9mBFw", AudioOut::AudioOutClose);
 	LIB_FUNC("GrQ9s4IrNaQ", AudioOut::AudioOutGetPortState);
+	LIB_FUNC("R5hemoKKID8", AudioOut::AudioOutGetSystemState);
 }
 
 } // namespace LibAudioOut