diff --git a/bin/ruby-build b/bin/ruby-build
index 3bc6cb2f..0ce0b709 100755
--- a/bin/ruby-build
+++ b/bin/ruby-build
@@ -592,7 +592,9 @@ fix_rbx_gem_binstubs() {
     for file in "$gemdir"/*; do
       binstub="${bindir}/${file##*/}"
       rm -f "$binstub"
-      sed -E "s:^#\!.+:#\!${bindir}/ruby:" < "$file" > "$binstub"
+      { echo "#!${bindir}/ruby"
+        cat "$file"
+      } > "$binstub"
       chmod +x "$binstub"
     done
     rm -rf "$gemdir"
diff --git a/test/build.bats b/test/build.bats
index 1900057c..f9650736 100644
--- a/test/build.bats
+++ b/test/build.bats
@@ -386,6 +386,57 @@ bundle exec rake install
 OUT
 }
 
+@test "fixes rbx binstubs" {
+  executable "${RUBY_BUILD_CACHE_PATH}/rubinius-2.0.0/gems/bin/rake" <<OUT
+#!rbx
+puts 'rake'
+OUT
+  executable "${RUBY_BUILD_CACHE_PATH}/rubinius-2.0.0/gems/bin/irb" <<OUT
+#!rbx
+print '>>'
+OUT
+  cached_tarball "rubinius-2.0.0" bin/ruby
+
+  stub bundle '--version : echo 1' true
+  stub rake \
+    '--version : echo 1' \
+    "install : mkdir -p '$INSTALL_ROOT'; cp -fR . '$INSTALL_ROOT'"
+
+  run_inline_definition <<DEF
+install_package "rubinius-2.0.0" "http://releases.rubini.us/rubinius-2.0.0.tar.gz" rbx
+DEF
+  assert_success
+
+  unstub bundle
+  unstub rake
+
+  run ls "${INSTALL_ROOT}/bin"
+  assert_output <<OUT
+irb
+rake
+ruby
+OUT
+
+  run $(type -p greadlink readlink | head -1) "${INSTALL_ROOT}/gems/bin"
+  assert_success '../bin'
+
+  assert [ -x "${INSTALL_ROOT}/bin/rake" ]
+  run cat "${INSTALL_ROOT}/bin/rake"
+  assert_output <<OUT
+#!${INSTALL_ROOT}/bin/ruby
+#!rbx
+puts 'rake'
+OUT
+
+  assert [ -x "${INSTALL_ROOT}/bin/irb" ]
+  run cat "${INSTALL_ROOT}/bin/irb"
+  assert_output <<OUT
+#!${INSTALL_ROOT}/bin/ruby
+#!rbx
+print '>>'
+OUT
+}
+
 @test "JRuby build" {
   executable "${RUBY_BUILD_CACHE_PATH}/jruby-1.7.9/bin/jruby" <<OUT
 #!${BASH}