diff --git a/lib/utils/validateRequired.js b/lib/utils/validateRequired.js
index a48de82f..0e677812 100644
--- a/lib/utils/validateRequired.js
+++ b/lib/utils/validateRequired.js
@@ -37,9 +37,9 @@ export function validateRequiredPositiveAmount(value) {
 }
 
 export function validatePositiveAmount(value) {
-  if (value !== '' || value === undefined || value === null) return undefined;
+  if (value === '' || value === undefined || value === null) return undefined;
 
-  return value > 0
+  return Number(value) > 0
     ? undefined
     : <FormattedMessage id="stripes-acq-components.validation.shouldBePositiveAmount" />;
 }