diff --git a/basis/json/reader/reader-tests.factor b/basis/json/reader/reader-tests.factor
index f33a127762..758c79cd25 100644
--- a/basis/json/reader/reader-tests.factor
+++ b/basis/json/reader/reader-tests.factor
@@ -1,5 +1,5 @@
 USING: assocs arrays json.reader kernel strings tools.test
-hashtables json io.streams.string ;
+hashtables json io.streams.string math ;
 IN: json.reader.tests
 
 { f } [ "false" json> ] unit-test
@@ -72,3 +72,7 @@ IN: json.reader.tests
     "\"\\u0000\\u0001\\u0002\\u0003\\u0004\\u0005\\u0006\\u0007\\b\\t\\n\\u000b\\f\\r\\u000e\\u000f\\u0010\\u0011\\u0012\\u0013\\u0014\\u0015\\u0016\\u0017\\u0018\\u0019\\u001a\\u001b\\u001c\\u001d\\u001e\\u001f\""
     json>
 ] unit-test
+
+{ 1/0. } [ "Infinity" json> ] unit-test
+{ -1/0. } [ "-Infinity" json> ] unit-test
+{ t } [ "NaN" json> fp-nan? ] unit-test
diff --git a/basis/json/reader/reader.factor b/basis/json/reader/reader.factor
index 91419399e0..f46226531a 100644
--- a/basis/json/reader/reader.factor
+++ b/basis/json/reader/reader.factor
@@ -12,7 +12,12 @@ IN: json.reader
 
 : json-number ( char stream -- num char )
     [ 1string ] [ "\s\t\r\n,:}]" swap stream-read-until ] bi*
-    [ append string>number ] dip ;
+    [ append {
+        { "Infinity" [ 1/0. ] }
+        { "-Infinity" [ -1/0. ] }
+        { "NaN" [ 0/0. ] }
+        [ string>number ]
+    } case ] dip ;
 
 : json-expect ( token stream -- )
     [ dup length ] [ stream-read ] bi* = [ json-error ] unless ; inline