diff --git a/src/Matcher/Pattern/Assert/Json.php b/src/Matcher/Pattern/Assert/Json.php
index afd6b3ad..652db0df 100644
--- a/src/Matcher/Pattern/Assert/Json.php
+++ b/src/Matcher/Pattern/Assert/Json.php
@@ -16,7 +16,13 @@ public static function isValid($value) : bool
             return false;
         }
 
-        if (null === \json_decode($value) && JSON_ERROR_NONE !== \json_last_error()) {
+        $result = \json_decode($value);
+
+        if (\is_float($result) && \is_infinite($result)) {
+            return false;
+        }
+
+        if (null === $result && JSON_ERROR_NONE !== \json_last_error()) {
             return false;
         }
 
diff --git a/tests/Matcher/JsonMatcherTest.php b/tests/Matcher/JsonMatcherTest.php
index 42ebbc3c..fce3376a 100644
--- a/tests/Matcher/JsonMatcherTest.php
+++ b/tests/Matcher/JsonMatcherTest.php
@@ -244,7 +244,11 @@ public static function positiveMatches()
             [
                 '[{"name": "Norbert"},{"name":"Michał"},{"name":"Bob"},{"name":"Martin"}]',
                 '"@array@.repeat({\"name\": \"@string@\"})"'
-            ]
+            ],
+            [
+                '{"something": "5e61188283825"}',
+                '{"something": "@string@"}',
+            ],
         ];
     }