diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index a732d400..b70fb561 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -2,6 +2,10 @@
 Changelog
 *********
 
+1.0.3 -- 2018-05-03
+===================
+* Finish fixing ``MANIFEST.in``.
+
 1.0.2 -- 2018-05-03
 ===================
 * Fill out ``MANIFEST.in`` to correctly include necessary files in source build.
diff --git a/MANIFEST.in b/MANIFEST.in
index 0ae4b35c..a88526aa 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -4,4 +4,9 @@ include LICENSE
 include requirements.txt
 
 recursive-include doc *
-recursive-include test *.py
\ No newline at end of file
+recursive-exclude doc .DS_Store *.pyc
+prune doc/build
+prune doc/lib/generated
+
+recursive-include test *
+recursive-exclude test .DS_Store *.pyc
\ No newline at end of file
diff --git a/src/dynamodb_encryption_sdk/identifiers.py b/src/dynamodb_encryption_sdk/identifiers.py
index 33192158..c49ec32a 100644
--- a/src/dynamodb_encryption_sdk/identifiers.py
+++ b/src/dynamodb_encryption_sdk/identifiers.py
@@ -14,7 +14,7 @@
 from enum import Enum
 
 __all__ = ('LOGGER_NAME', 'CryptoAction', 'EncryptionKeyType', 'KeyEncodingType')
-__version__ = '1.0.2'
+__version__ = '1.0.3'
 
 LOGGER_NAME = 'dynamodb_encryption_sdk'
 USER_AGENT_SUFFIX = 'DynamodbEncryptionSdkPython/{}'.format(__version__)
diff --git a/test/requirements.txt b/test/requirements.txt
index 34d6a3b4..5515ac9e 100644
--- a/test/requirements.txt
+++ b/test/requirements.txt
@@ -1,6 +1,6 @@
 hypothesis
 mock
-git+https://github.com/spulec/moto.git
+moto>=1.3.3
 pytest>=3.3.1
 pytest-cov
 pytest-mock
diff --git a/test/source-build-check.sh b/test/source-build-check.sh
new file mode 100755
index 00000000..91403af4
--- /dev/null
+++ b/test/source-build-check.sh
@@ -0,0 +1,27 @@
+#!/bin/bash
+# Verify that tests can be successfully run from the source build.
+#
+#NOTE: Humans should not run this file directly. If you want to run this check, use the
+#   tox to run the "sourcebuildcheck" test environment.
+
+WORKINGDIR=$1
+DISTDIR=$2
+
+echo "Locating the source build and copying it into the working directory."
+DISTFILE=`ls $DISTDIR/dynamodb-encryption-sdk-*.tar.gz | tail -1`
+cp $DISTFILE $WORKINGDIR
+DISTFILE=`ls $WORKINGDIR/dynamodb-encryption-sdk-*.tar.gz | tail -1`
+
+echo "Extracting the source build."
+cd $WORKINGDIR
+tar xzvf $DISTFILE
+rm $DISTFILE
+EXTRACTEDDIR=`ls | tail -1`
+cd $EXTRACTEDDIR
+
+echo "Installing requirements from extracted source build."
+pip install -r test/requirements.txt
+pip install -e .
+
+echo "Running tests from extracted source build."
+pytest --cov dynamodb_encryption_sdk -m "local and not slow and not veryslow and not nope"
diff --git a/tox.ini b/tox.ini
index 1d754963..5e7099a1 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 envlist =
-    py{27,34,35,36}-{local,integ,examples}-fast, nocmk,
+    py{27,34,35,36}-{local,integ,examples}-fast, nocmk, sourcebuildcheck,
     bandit, doc8, readme,
     flake8, pylint,
     flake8-tests, pylint-tests,
@@ -66,6 +66,17 @@ sitepackages = False
 deps = -rtest/requirements.txt
 commands = {[testenv:base-command]commands} -m "local and not slow and not veryslow and not nope"
 
+# Verify that tests can be successfully run from the source build.
+[testenv:sourcebuildcheck]
+basepython = python3
+sitepackages = False
+recreate = True
+deps =
+    {[testenv:build]deps}
+commands =
+    {[testenv:build]commands}
+    {toxinidir}/test/source-build-check.sh {envtmpdir} {toxinidir}/dist
+
 # mypy
 [testenv:mypy-coverage]
 commands =