diff --git a/setup.py b/setup.py
index da10fdfa8e6..36a0d77a73f 100644
--- a/setup.py
+++ b/setup.py
@@ -320,12 +320,13 @@ class PyBuildExt(build_ext):
         # the environment variable is not set even though the value were passed
         # into configure and stored in the Makefile (issue found on OS X 10.3).
         for env_var, arg_name, dir_list in (
+                ('LDFLAGS', '-R', self.compiler.runtime_library_dirs),
                 ('LDFLAGS', '-L', self.compiler.library_dirs),
                 ('CPPFLAGS', '-I', self.compiler.include_dirs)):
             env_val = sysconfig.get_config_var(env_var)
             if env_val:
                 # To prevent optparse from raising an exception about any
-                # options in env_val that is doesn't know about we strip out
+                # options in env_val that it doesn't know about we strip out
                 # all double dashes and any dashes followed by a character
                 # that is not for the option we are dealing with.
                 #