diff --git a/modisco/util.py b/modisco/util.py
index 86615d2..722aad8 100644
--- a/modisco/util.py
+++ b/modisco/util.py
@@ -474,9 +474,14 @@ def compute_per_position_ic(ppm, background, pseudocount):
     assert len(ppm.shape)==2
     assert ppm.shape[1]==len(background),\
             "Make sure the letter axis is the second axis"
-    assert (np.max(np.abs(np.sum(ppm, axis=1)-1.0)) < 1e-5),(
-             "Probabilities don't sum to 1 along axis 1 in "
-             +str(ppm)+"\n"+str(np.sum(ppm, axis=1)))
+    if (np.max(np.abs(np.sum(ppm, axis=1)-1.0)) < 1e-5):
+        print("WARNING: Probabilities don't sum to 1 in all the rows; this can"
+              +" be caused by zero-padding. Will renormalize. PPM:\n"
+              +str(ppm)
+              +"\nProbability sums:\n"
+              +str(np.sum(ppm, axis=1)))
+        ppm = ppm/np.sum(ppm, axis=1)[:,None]
+
     alphabet_len = len(background)
     ic = ((np.log((ppm+pseudocount)/(1 + pseudocount*alphabet_len))/np.log(2))
           *ppm - (np.log(background)*background/np.log(2))[None,:])
diff --git a/setup.py b/setup.py
index 0c43c38..2012fe4 100644
--- a/setup.py
+++ b/setup.py
@@ -6,7 +6,7 @@
           description='TF MOtif Discovery from Importance SCOres',
           long_description="""Algorithm for discovering consolidated patterns from base-pair-level importance scores""",
           url='https://github.com/kundajelab/tfmodisco',
-          version='0.5.10.0',
+          version='0.5.10.1',
           packages=find_packages(),
           package_data={
                 '': ['cluster/phenograph/louvain/*convert*', 'cluster/phenograph/louvain/*community*', 'cluster/phenograph/louvain/*hierarchy*']