diff --git a/Pipfile b/Pipfile
index 6c8c8916..f62e6fb1 100644
--- a/Pipfile
+++ b/Pipfile
@@ -2,7 +2,11 @@
 url = "https://pypi.org/"
 verify_ssl = true
 
+[requires]
+python_version = '2.7'
+
 [packages]
 crayons = "*"
 toml = "*"
 click = "*"
+"delegator.py" = "*"
diff --git a/Pipfile.freeze b/Pipfile.freeze
index 7bb69f76..b15977a4 100644
--- a/Pipfile.freeze
+++ b/Pipfile.freeze
@@ -1 +1 @@
-{"default": {"colorama": "==0.3.7", "crayons": "==0.1.1", "toml": "==0.9.2", "click": "==6.7"}, "develop": {}, "_meta": {"sources": [{"url": "https://pypi.org/", "verify_ssl": true}], "requires": {}, "Pipfile-sha256": "8cfe2a7c071e7058f9a2cd8a8e6f02b6f3384eb2f8c107565e9ad8f98a0b10ed"}}
\ No newline at end of file
+{"default": {"crayons": "==0.1.1", "colorama": "==0.3.7", "daemon": "==1.1", "delegator.py": "==0.0.1", "pexpect": "==4.2.1", "toml": "==0.9.2", "click": "==6.7", "ptyprocess": "==0.5.1"}, "develop": {}, "_meta": {"sources": [{"url": "https://pypi.org/", "verify_ssl": true}], "requires": {}, "Pipfile-sha256": "ce6157382da4a84c865a7f63c551bb4112c15c3168158e4b21ce08c933e4c164"}}
\ No newline at end of file
diff --git a/pipenv/_pipfile/api.py b/pipenv/_pipfile/api.py
index 10e1307b..5d57cbb2 100644
--- a/pipenv/_pipfile/api.py
+++ b/pipenv/_pipfile/api.py
@@ -177,9 +177,7 @@ class Pipfile(object):
         }
 
         # Assert each specified requirement.
-        for requirement in self.data['_meta']['requires']:
-            marker = requirement['marker']
-            specifier = requirement['specifier']
+        for marker, specifier in self.data['_meta']['requires'].iteritems():
 
             if marker in lookup:
                 try:
diff --git a/pipenv/core.py b/pipenv/core.py
index a28b81d7..66f0f3e3 100644
--- a/pipenv/core.py
+++ b/pipenv/core.py
@@ -447,8 +447,15 @@ def venv(bare=False):
 def purge():
     do_purge()
 
+@click.command()
+def check():
+    click.echo(crayons.yellow('Checking PEP 508 requirements...'))
 
+    # Load the Pipfile.
+    p = pipfile.load(project.pipfile_location())
 
+    # Assert the given requirements.
+    p.assert_requirements()
 
 # Install click commands.
 cli.add_command(init)
@@ -459,6 +466,7 @@ cli.add_command(freeze)
 cli.add_command(py)
 cli.add_command(venv)
 cli.add_command(purge)
+cli.add_command(check)
 
 
 if __name__ == '__main__':