diff --git a/mgwr/gwr.py b/mgwr/gwr.py
index 9ee30c6..3027bce 100755
--- a/mgwr/gwr.py
+++ b/mgwr/gwr.py
@@ -210,7 +210,7 @@ def __init__(self, coords, y, X, bw, family=Gaussian(), offset=None,
         """
         Initialize class
         """
-        GLM.__init__(self, y, X, family, constant=constant)
+        GLM.__init__(self, y, X, family, constant=constant, offset=offset)
         self.constant = constant
         self.sigma2_v1 = sigma2_v1
         self.coords = np.array(coords)
diff --git a/mgwr/summary.py b/mgwr/summary.py
index d3b58e7..8cc57e7 100755
--- a/mgwr/summary.py
+++ b/mgwr/summary.py
@@ -15,7 +15,7 @@ def summaryModel(self):
 def summaryGLM(self):
 
     XNames = ["X" + str(i) for i in range(self.k)]
-    glm_rslt = GLM(self.model.y, self.model.X, constant=False,
+    glm_rslt = GLM(self.model.y, self.model.X, constant=False, offset=self.model.offset,
                    family=self.family).fit()
 
     summary = "%s\n" % ('Global Regression Results')