diff --git a/media/libcubeb/src/moz.build b/media/libcubeb/src/moz.build
index c91665adf9d4..c4574a60cbd5 100644
--- a/media/libcubeb/src/moz.build
+++ b/media/libcubeb/src/moz.build
@@ -60,6 +60,8 @@ if CONFIG['OS_TARGET'] == 'Darwin':
             'cubeb_osx_run_loop.c',
         ]
     DEFINES['USE_AUDIOUNIT'] = True
+    if CONFIG['MOZ_AUDIOUNIT_RUST']:
+        DEFINES['USE_AUDIOUNIT_RUST'] = True
 
 if CONFIG['OS_TARGET'] == 'WINNT':
     SOURCES += [
diff --git a/toolkit/library/gtest/rust/Cargo.toml b/toolkit/library/gtest/rust/Cargo.toml
index e7317587b5d9..49cf7969ec6d 100644
--- a/toolkit/library/gtest/rust/Cargo.toml
+++ b/toolkit/library/gtest/rust/Cargo.toml
@@ -10,6 +10,7 @@ bindgen = ["gkrust-shared/bindgen"]
 servo = ["gkrust-shared/servo"]
 quantum_render = ["gkrust-shared/quantum_render"]
 cubeb-remoting = ["gkrust-shared/cubeb-remoting"]
+cubeb_coreaudio_rust = ["gkrust-shared/cubeb_coreaudio_rust"]
 cubeb_pulse_rust = ["gkrust-shared/cubeb_pulse_rust"]
 gecko_debug = ["gkrust-shared/gecko_debug"]
 gecko_refcount_logging = ["gkrust-shared/gecko_refcount_logging"]
diff --git a/toolkit/library/rust/Cargo.toml b/toolkit/library/rust/Cargo.toml
index e539d94a7c4e..2f67e593444e 100644
--- a/toolkit/library/rust/Cargo.toml
+++ b/toolkit/library/rust/Cargo.toml
@@ -12,6 +12,7 @@ quantum_render = ["gkrust-shared/quantum_render"]
 webrender_debugger = ["gkrust-shared/webrender_debugger"]
 cubeb-remoting = ["gkrust-shared/cubeb-remoting"]
 cubeb_pulse_rust = ["gkrust-shared/cubeb_pulse_rust"]
+cubeb_coreaudio_rust = ["gkrust-shared/cubeb_coreaudio_rust"]
 gecko_debug = ["gkrust-shared/gecko_debug"]
 gecko_refcount_logging = ["gkrust-shared/gecko_refcount_logging"]
 simd-accel = ["gkrust-shared/simd-accel"]
diff --git a/toolkit/library/rust/gkrust-features.mozbuild b/toolkit/library/rust/gkrust-features.mozbuild
index 72caac0e922e..bf8e73c98da6 100644
--- a/toolkit/library/rust/gkrust-features.mozbuild
+++ b/toolkit/library/rust/gkrust-features.mozbuild
@@ -19,6 +19,9 @@ if CONFIG['MOZ_WEBRENDER_DEBUGGER']:
 if CONFIG['MOZ_PULSEAUDIO']:
     gkrust_features += ['cubeb_pulse_rust']
 
+if CONFIG['MOZ_AUDIOUNIT_RUST']:
+    gkrust_features += ['cubeb_coreaudio_rust']
+
 if CONFIG['MOZ_RUST_SIMD']:
     gkrust_features += ['simd-accel']
 
diff --git a/toolkit/library/rust/shared/Cargo.toml b/toolkit/library/rust/shared/Cargo.toml
index c659552cdc95..49ff9d8291f6 100644
--- a/toolkit/library/rust/shared/Cargo.toml
+++ b/toolkit/library/rust/shared/Cargo.toml
@@ -18,6 +18,7 @@ prefs_parser = { path = "../../../../modules/libpref/parser" }
 profiler_helper = { path = "../../../../tools/profiler/rust-helper", optional = true }
 mozurl = { path = "../../../../netwerk/base/mozurl" }
 webrender_bindings = { path = "../../../../gfx/webrender_bindings", optional = true }
+cubeb-coreaudio = { path = "../../../../media/libcubeb/cubeb-coreaudio-rs", optional = true }
 cubeb-pulse = { path = "../../../../media/libcubeb/cubeb-pulse-rs", optional = true, features=["pulse-dlopen"] }
 cubeb-sys = { version = "0.5.0", optional = true, features=["gecko-in-tree"] }
 encoding_c = "0.9.0"
@@ -51,6 +52,7 @@ servo = ["geckoservo"]
 quantum_render = ["webrender_bindings"]
 webrender_debugger = ["webrender_bindings/webrender_debugger"]
 cubeb-remoting = ["cubeb-sys", "audioipc-client", "audioipc-server"]
+cubeb_coreaudio_rust = ["cubeb-sys", "cubeb-coreaudio"]
 cubeb_pulse_rust = ["cubeb-sys", "cubeb-pulse"]
 gecko_debug = ["geckoservo/gecko_debug", "nsstring/gecko_debug"]
 gecko_refcount_logging = ["geckoservo/gecko_refcount_logging"]
diff --git a/toolkit/library/rust/shared/lib.rs b/toolkit/library/rust/shared/lib.rs
index c5ff9e10dc31..1e544632b20e 100644
--- a/toolkit/library/rust/shared/lib.rs
+++ b/toolkit/library/rust/shared/lib.rs
@@ -19,6 +19,8 @@ extern crate profiler_helper;
 extern crate mozurl;
 #[cfg(feature = "quantum_render")]
 extern crate webrender_bindings;
+#[cfg(feature = "cubeb_coreaudio_rust")]
+extern crate cubeb_coreaudio;
 #[cfg(feature = "cubeb_pulse_rust")]
 extern crate cubeb_pulse;
 extern crate encoding_c;
diff --git a/toolkit/moz.configure b/toolkit/moz.configure
index 2eb0684861f1..1637dd8575e8 100644
--- a/toolkit/moz.configure
+++ b/toolkit/moz.configure
@@ -153,6 +153,15 @@ pulseaudio = pkg_check_modules('MOZ_PULSEAUDIO', 'libpulse', when='--enable-puls
 set_config('MOZ_PULSEAUDIO', depends_if(pulseaudio)(lambda _: True))
 set_define('MOZ_PULSEAUDIO', depends_if(pulseaudio)(lambda _: True))
 
+# AudioUnit cubeb Rust backend
+# ==============================================================
+@depends(target)
+def enable_audiounit_rust(target):
+    return target.os == 'OSX' and target.kernel == 'Darwin'
+
+set_config('MOZ_AUDIOUNIT_RUST', True, when=enable_audiounit_rust)
+set_define('MOZ_AUDIOUNIT_RUST', True, when=enable_audiounit_rust)
+
 # Javascript engine
 # ==============================================================
 include('../js/moz.configure')