diff --git a/.dir-locals.el b/.dir-locals.el
new file mode 100644
index 0000000..d526aa3
--- /dev/null
+++ b/.dir-locals.el
@@ -0,0 +1,2 @@
+((scheme-mode . ((flymake-chicken-command-args . ("-X" "r7rs" "-R" "r7rs" "-X" "chalk"))
+                 (geiser-scheme . 'chicken))))
diff --git a/README.md b/README.md
index 48a84b4..253b381 100644
--- a/README.md
+++ b/README.md
@@ -30,11 +30,12 @@ API
 
 * Transforming EDN into Scheme: `(read-edn <port>)`
 * Transforming Scheme into EDN: `(write-edn <port> <datastructure>)`
-* Using reader tags: the library contains a public a-list `tag-handlers`. To register a handler, add an a-list entry where the key is the tag without `\#` and as a keyword, and the value a one-argument procedure.
+* Using reader tags: the library contains a parameter `tag-handlers` containing an a-list. To register a handler, add an a-list entry where the key is the tag without `\#` and as a keyword, and the value a one-argument procedure.
 
 Releases
 --------
 
+ * **1.0**: Made the custom parsers a parameter.
  * **0.5.2**: Update for Chicken 5
  * **0.5.1**: Small compatibility improvements: "/" now starts a symbol as well, and "," is treated as whitespace.
  * **0.5**: Reader tag support.
diff --git a/edn-impl.scm b/edn-impl.scm
index 3d46d0e..c541f47 100644
--- a/edn-impl.scm
+++ b/edn-impl.scm
@@ -159,7 +159,7 @@
 @("An a-list containing the handlers for reader tags. You can register your own reader tags by simply adding a new a-list entry.
 
 Example for a tag \"#keywordify\": add the entry `(cons keywordify: keywordify-procedure)`.")
-  (list (cons _:  (lambda (input) edn/omit:))))
+  (make-parameter (list (cons _:  (lambda (input) edn/omit:)))))
 
 (define reader-handlers
   (list (cons (is-char? #\() edn->list)
@@ -182,10 +182,10 @@ Example for a tag \"#keywordify\": add the entry `(cons keywordify: keywordify-p
        (contains-tag-handler? (car in))))
 
 (define (contains-tag-handler? tag)
-  (assoc (cdr tag) tag-handlers))
+  (assoc (cdr tag) (tag-handlers)))
 
 (define (call-tag tag data)
-  ((cdr (assoc (cdr tag) tag-handlers)) data))
+  ((cdr (assoc (cdr tag) (tag-handlers))) data))
 
 (define (parse-edn state)
   (lambda (in-port)
diff --git a/edn.egg b/edn.egg
index a5571a2..7751334 100644
--- a/edn.egg
+++ b/edn.egg
@@ -4,7 +4,7 @@
  (synopsis "EDN data reader/writer.")
  (category parsing)
  (license "BSD")
- (version "0.5.2")
+ (version "1.0")
  (dependencies r7rs srfi-69 srfi-1 chalk)
  (test-dependencies r7rs srfi-64 chalk)
  (components (extension edn
diff --git a/edn.release-info b/edn.release-info
index 7452c3e..1277f52 100644
--- a/edn.release-info
+++ b/edn.release-info
@@ -1,4 +1,5 @@
 (repo git "https:///gitea.lyrion.ch/zilti/edn.git")
 (uri targz "https://gitea.lyrion.ch/zilti/edn/archive/{egg-release}.tar.gz")
+(release "1.0") ;; Made the custom parsers a parameter
 (release "0.5.3") ;; Replaced Hahn with Chalk
 (release "0.5.2") ;; Update for Chicken 5
diff --git a/tests/run.scm b/tests/run.scm
index 4c2342c..063f342 100644
--- a/tests/run.scm
+++ b/tests/run.scm
@@ -1,4 +1,4 @@
-(import r7rs)
+(import r7rs chalk)
 (require-extension srfi-69 srfi-64 srfi-88 srfi-1)
 ;;(import (chicken port))
 (include "../edn-impl.scm")
@@ -50,9 +50,9 @@
 (test-begin "Tag handling")
 (test-equal (wifs "(1 2 #_ 3 4)" read-edn) '(1 2 4))
 
-(set! tag-handlers (cons (cons keywordify:
+(tag-handlers (cons (cons keywordify:
 			       (lambda (input)
 				 (string->keyword (symbol->string input))))
-			 tag-handlers))
+			        (tag-handlers)))
 (test-equal (wifs "(asdf #keywordify qwertz)" read-edn) '(asdf qwertz:))
 (test-end "Tag handling")