diff --git a/mec/data.py b/mec/data.py
index a6dbf28..8b46061 100644
--- a/mec/data.py
+++ b/mec/data.py
@@ -253,6 +253,7 @@ def create_blp_instruments(df, theseries):
     nodes_ti_k = (O_t[:,None,None] + unobs[ ['const','hpwt','air','mpd','space']].to_numpy()[None,:,:]).reshape((T*I,-1))
     agent_data=pd.DataFrame()
     agent_data[ ['market_ids','weights']+ ['nodes' +str(i) for i in [0,1,2,3,4] ] + ['income'] ] = np.block([[year_ti[:,None],weights_ti[:,None],nodes_ti_k,income_ti[:,None] ]])
+    agent_data['market_ids']=agent_data['market_ids'].astype(int) 
 
     # check consistency with pyblp
     if pyblp_compatibility:
diff --git a/setup.py b/setup.py
index 35d22a2..5a1508a 100644
--- a/setup.py
+++ b/setup.py
@@ -2,7 +2,7 @@
 
 setup(
 	name="mec",
-	version="0.148",
+	version="0.149",
 	authors=["Alfred Galichon"],
 	author_email="ag133@nyu.edu",
 	licence="",