diff --git a/src/Symfony/Component/Form/Extension/Core/DataTransformer/NumberToLocalizedStringTransformer.php b/src/Symfony/Component/Form/Extension/Core/DataTransformer/NumberToLocalizedStringTransformer.php
index 2a6d146f90824..1457ab872b2b5 100644
--- a/src/Symfony/Component/Form/Extension/Core/DataTransformer/NumberToLocalizedStringTransformer.php
+++ b/src/Symfony/Component/Form/Extension/Core/DataTransformer/NumberToLocalizedStringTransformer.php
@@ -104,7 +104,8 @@ public function reverseTransform(mixed $value): int|float|null
             $value = str_replace(',', $decSep, $value);
         }
 
-        if (str_contains($value, $decSep)) {
+        //If the value is in exponential notation with a negative exponent, we end up with a float value too
+        if (str_contains($value, $decSep) || stripos($value, 'e-') !== false) {
             $type = \NumberFormatter::TYPE_DOUBLE;
         } else {
             $type = \PHP_INT_SIZE === 8