diff --git a/hmm/hmm_module.c b/hmm/hmm_module.c
index 63811d31d13f3c6695ebea04ae40235838e0b3a3..d76e3f8a1a8d2eacbaf927229e7b03ce81f8bce1 100644
--- a/hmm/hmm_module.c
+++ b/hmm/hmm_module.c
@@ -132,18 +132,18 @@ CA_Methods[] = {
 };
 
 static struct PyModuleDef
-chains_addiction_module = {
+chainsaddiction_module = {
     PyModuleDef_HEAD_INIT,
-    "chains_addiction",
+    "chainsaddiction",
     NULL,
     -1,
     CA_Methods
 };
 
 PyMODINIT_FUNC
-PyInit_chains_addiction (void)
+PyInit_chainsaddiction (void)
 {
     import_array ();
-    return PyModule_Create (&chains_addiction_module);
+    return PyModule_Create (&chainsaddiction_module);
 }
 
diff --git a/setup.py b/setup.py
index bc7bdc0610adf7e5d93a12fe1b677cc0c55ad7cd..656ca3e17427161d195c0340dcbe7938ff714589 100644
--- a/setup.py
+++ b/setup.py
@@ -11,7 +11,7 @@ setup(
         include_dirs    = get_numpy_include_dirs(),
         ext_modules     =   [
                                 Extension(
-                                    'chains_addiction',
+                                    'chainsaddiction',
                                     sources     = [ 'hmm/stats.c',
                                                     'hmm/fwbw.c',
                                                     'hmm/em.c',