diff --git a/js/src/make-source-package.sh b/js/src/make-source-package.sh
index f4131b98fb..6e44dd977e 100644
--- a/js/src/make-source-package.sh
+++ b/js/src/make-source-package.sh
@@ -95,10 +95,6 @@ case $cmd in
     # copy build and config directory.
     cp -pPR ${TOPSRCDIR}/build ${TOPSRCDIR}/config ${tgtpath}
 
-    # copy cargo config
-    ${MKDIR} -p ${tgtpath}/.cargo
-    cp -pPR ${TOPSRCDIR}/.cargo/config.in ${tgtpath}/.cargo
-
     # generate configure files to avoid build dependency on autoconf-2.13
     cp -PR ${TOPSRCDIR}/js/src/configure.in ${tgtpath}/js/src/configure
     chmod a+x ${tgtpath}/js/src/configure
diff --git a/moz.build b/moz.build
index fee89428de..2c02ec3a01 100644
--- a/moz.build
+++ b/moz.build
@@ -84,6 +84,4 @@ if not CONFIG['JS_STANDALONE'] and CONFIG['MOZ_BUILD_APP']:
     # Bring in the configuration for the configured application.
     include('/' + CONFIG['MOZ_BUILD_APP'] + '/app.mozbuild')
 
-CONFIGURE_SUBST_FILES += ['.cargo/config']
-
 include('build/templates.mozbuild')