diff --git a/src/requirements/production.txt b/src/requirements/production.txt
index 73f68ed9ba..a860d1ac12 100644
--- a/src/requirements/production.txt
+++ b/src/requirements/production.txt
@@ -35,7 +35,7 @@ stripe==1.22.*
 paypalrestsdk==1.12.*
 pycparser==2.13  # https://github.com/eliben/pycparser/issues/147
 # Banktransfer
-chardet
+chardet<3.1.0,>=3.0.2
 mt-940==3.2
 vobject==0.9.*
 pycountry