diff --git a/nimbus/p2p/validate.nim b/nimbus/p2p/validate.nim
index 779f6c680..0d14b7718 100644
--- a/nimbus/p2p/validate.nim
+++ b/nimbus/p2p/validate.nim
@@ -180,6 +180,9 @@ proc validateHeader(db: BaseChainDB; header, parentHeader: BlockHeader;
   if header.gasUsed == 0 and 0 < numTransactions:
     return err("zero gasUsed but tranactions present");
 
+  if header.gasUsed < 0 or header.gasUsed > header.gasLimit:
+    return err("gasUsed should be non negative and smaller or equal gasLimit")
+  
   if header.blockNumber != parentHeader.blockNumber + 1:
     return err("Blocks must be numbered consecutively")