diff --git a/scripts/generate-validator-signature.sh b/scripts/generate-validator-signature.sh
index e8d3626f..8658a286 100644
--- a/scripts/generate-validator-signature.sh
+++ b/scripts/generate-validator-signature.sh
@@ -33,7 +33,7 @@ read VALIDATOR_INITIAL_DELEGATION_IN_ETHER
 if [ -z $VALIDATOR_INITIAL_DELEGATION_IN_ETHER ]; then
     VALIDATOR_INITIAL_DELEGATION_IN_GWEI=32000000000
 elif [[ "$VALIDATOR_INITIAL_DELEGATION_IN_ETHER" =~ ^[0-9]+$ ]]; then
-    VALIDATOR_INITIAL_DELEGATION_IN_GWEI=$(expr $VALIDATOR_INITIAL_DELEGATION_IN_ETHER \* 1000000000)
+    VALIDATOR_INITIAL_DELEGATION_IN_GWEI=$(echo "$VALIDATOR_INITIAL_DELEGATION_IN_ETHER * 1000000000" | bc)
 else
     echo "$VALIDATOR_INITIAL_DELEGATION_IN_ETHER not a integer"
     exit 1
@@ -73,4 +73,4 @@ echo "pubkey: $pubkey"
 echo "validator_address: $validator_address"
 echo "signature: $signature\n"
 
-echo "To initialize the validator, you need to call the createAndInitializeValidatorIfNecessary function with the pubkey and signature."
\ No newline at end of file
+echo "To initialize the validator, you need to call the createAndInitializeValidatorIfNecessary function with the pubkey and signature."