diff --git a/ports/libsimpleservo/api/Cargo.toml b/ports/libsimpleservo/api/Cargo.toml
index f78ca00a741..0dd05e38561 100644
--- a/ports/libsimpleservo/api/Cargo.toml
+++ b/ports/libsimpleservo/api/Cargo.toml
@@ -48,6 +48,7 @@ native-bluetooth = ["libservo/native-bluetooth"]
 no_static_freetype = ["libservo/no_static_freetype"]
 no-wgl = ["libservo/no-wgl"]
 oculusvr = ["libservo/oculusvr"]
+profilemozjs = ["libservo/profilemozjs"]
 refcell_backtrace = ["libservo/refcell_backtrace"]
 webdriver = ["libservo/webdriver"]
 uwp = ["libservo/uwp", "webxr/openxr-api"]
diff --git a/ports/libsimpleservo/capi/Cargo.toml b/ports/libsimpleservo/capi/Cargo.toml
index 7c93998ed0f..2c629587c8f 100644
--- a/ports/libsimpleservo/capi/Cargo.toml
+++ b/ports/libsimpleservo/capi/Cargo.toml
@@ -43,6 +43,7 @@ max_log_level = ["simpleservo/max_log_level"]
 native-bluetooth = ["simpleservo/native-bluetooth"]
 no-wgl = ["simpleservo/no-wgl"]
 oculusvr = ["simpleservo/oculusvr"]
+profilemozjs = ["simpleservo/profilemozjs"]
 refcell_backtrace = ["simpleservo/refcell_backtrace"]
 uwp = ["simpleservo/uwp"]
 webdriver = ["simpleservo/webdriver"]