diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8a21d28c91..98bf618256 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ### Features
 
 ### Fixes
+- [#4582](https://github.com/blockscout/blockscout/pull/4582) - Fix NaN input on write contract page
 
 ### Chore
 
diff --git a/apps/block_scout_web/assets/js/lib/smart_contract/write.js b/apps/block_scout_web/assets/js/lib/smart_contract/write.js
index fd6bacb3ec..ed65b7b0a5 100644
--- a/apps/block_scout_web/assets/js/lib/smart_contract/write.js
+++ b/apps/block_scout_web/assets/js/lib/smart_contract/write.js
@@ -151,5 +151,5 @@ function getTxValue ($functionInputs) {
   const $txValue = $functionInputs.filter('[tx-value]:first')
   const txValue = $txValue && $txValue.val() && parseFloat($txValue.val()) * WEI_MULTIPLIER
   const txValueStr = txValue && txValue.toString(16)
-  return txValueStr
+  return '0x' + txValueStr
 }