diff --git a/bloop/engine.py b/bloop/engine.py
index 4374af4e..ef3412fe 100644
--- a/bloop/engine.py
+++ b/bloop/engine.py
@@ -1,4 +1,3 @@
-import blinker
 import declare
 
 from .client import Client
@@ -8,7 +7,7 @@
 from .index import Index
 from .model import ModelMetaclass
 from .tracking import clear, is_model_verified, sync, verify_model
-from .util import walk_subclasses
+from .util import walk_subclasses, signal
 
 
 __all__ = ["Engine", "before_bind_model", "before_create_table"]
@@ -21,8 +20,8 @@
 }
 
 # Signals!
-before_bind_model = blinker.signal("before_bind_model")
-before_create_table = blinker.signal("before_create_table")
+before_bind_model = signal("before_bind_model")
+before_create_table = signal("before_create_table")
 
 
 def value_of(column):
diff --git a/bloop/util.py b/bloop/util.py
index 6bc3779b..d7bdd3d3 100644
--- a/bloop/util.py
+++ b/bloop/util.py
@@ -1,7 +1,12 @@
+import blinker
 import weakref
 
+__all__ = ["WeakDefaultDictionary", "ordered", "signal", "walk_subclasses"]
 
-__all__ = ["ordered", "walk_subclasses", "WeakDefaultDictionary"]
+# Isolate to avoid collisions with other modules
+# Don't expose the namespace.
+__signals = blinker.Namespace()
+signal = __signals.signal
 
 
 def ordered(obj):
diff --git a/tox.ini b/tox.ini
index 22666304..7d9bed82 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 basepython=python35
-envlist = unit, docs
+envlist = unit, integ, docs
 
 [testenv:unit]
 deps = pytest
@@ -13,7 +13,6 @@ commands =
 
 [testenv:integ]
 passenv = AWS_ACCESS_KEY_ID AWS_SECRET_ACCESS_KEY
-ignore_errors = True
 deps = pytest
        coverage
 commands = py.test tests/integ []