diff --git a/chainlib_eth_celo/block_dialect_filter.py b/chainlib_eth_celo/block_dialect_filter.py
index 3d2932a..f647a99 100644
--- a/chainlib_eth_celo/block_dialect_filter.py
+++ b/chainlib_eth_celo/block_dialect_filter.py
@@ -1,5 +1,16 @@
-from chainlib.dialect import DialectFilter as BaseDialectFilter
+from chainlib.eth.dialect import DialectFilter as BaseDialectFilter
+
 
 class DialectFilter(BaseDialectFilter):
     def apply_block(self, block):
         block.src['gas_limit'] = '0x0'
+
+
+    def apply_src(self, src):
+        src = super(DialectFilter, self).apply_src(src)
+        try:
+            if src['gas_price'] == None:
+                src['gas_price'] = '0x0'
+        except KeyError:
+            pass
+        return src