diff --git a/lib/OfxParser/Ofx.php b/lib/OfxParser/Ofx.php
index c3d0b6e..872aedb 100644
--- a/lib/OfxParser/Ofx.php
+++ b/lib/OfxParser/Ofx.php
@@ -310,7 +310,7 @@ private function createDateTimeFromStr($dateString, $ignoreErrors = false)
     private function createAmountFromStr($amountString)
     {
         // Decimal mark style (UK/US): 000.00 or 0,000.00
-        if (preg_match('/^-?([\d,]+)(\.?)([\d]{2})$/', $amountString) === 1) {
+        if (preg_match('/^-?([\d,]+)(\.)([\d]{2})$/', $amountString) === 1) {
             return (float)preg_replace(
                 ['/([,]+)/', '/\.?([\d]{2})$/'],
                 ['', '.$1'],
@@ -319,7 +319,7 @@ private function createAmountFromStr($amountString)
         }
 
         // European style: 000,00 or 0.000,00
-        if (preg_match('/^-?([\d\.]+,?[\d]{2})$/', $amountString) === 1) {
+        if (preg_match('/^-?([\d\.]+,[\d]{2})$/', $amountString) === 1) {
             return (float)preg_replace(
                 ['/([\.]+)/', '/,?([\d]{2})$/'],
                 ['', '.$1'],
diff --git a/tests/OfxParser/OfxTest.php b/tests/OfxParser/OfxTest.php
index 486f287..1d3d02c 100644
--- a/tests/OfxParser/OfxTest.php
+++ b/tests/OfxParser/OfxTest.php
@@ -37,7 +37,12 @@ public function amountConversionProvider()
             '-1.000,00' => ['-1.000,00', -1000.0],
             '1' => ['1', 1.0],
             '10' => ['10', 10.0],
-            '100' => ['100', 1.0], // @todo this is weird behaviour, should not really expect this
+            '100' => ['100', 100.0],
+            '1000' => ['1000', 1000.0],
+            '10000' => ['10000', 10000.0],
+            '-100'  => ['-100', -100.0],
+            '-1000' => ['-1000', -1000.0],
+            '-10000' => ['-10000', -10000.0]
         ];
     }