diff --git a/core/math/parser/parser-tests.factor b/core/math/parser/parser-tests.factor
index df9abe7924..f27d9266f3 100644
--- a/core/math/parser/parser-tests.factor
+++ b/core/math/parser/parser-tests.factor
@@ -361,8 +361,9 @@ unit-test
 { f } [ "0o0" bin> ] unit-test
 { f } [ "0x0" bin> ] unit-test
 
-! #1229, float parsing bug
+! #1229, float parsing bug, and a regression
 { -0.5 } [ "-.5" dec> ] unit-test
+{ "0" } [ "0" hex> ] unit-test
 
 { t } [ most-positive-fixnum number>string string>number fixnum? ] unit-test
 { t } [ most-negative-fixnum number>string string>number fixnum? ] unit-test
diff --git a/core/math/parser/parser.factor b/core/math/parser/parser.factor
index 3f1edd5a3a..c60d60aa78 100644
--- a/core/math/parser/parser.factor
+++ b/core/math/parser/parser.factor
@@ -285,6 +285,7 @@ DEFER: @neg-digit
             { CHAR: b [ pick radix>> 16 = [ CHAR: b swap call ] [ @abort ] if ] }
             { CHAR: o [ @abort ] }
             { CHAR: x [ @abort ] }
+            { f [ 4drop 0 ] }
             [ swap call ]
         } case
     ] curry require-next-digit ; inline