diff --git a/smnp/ast/node/atom.py b/smnp/ast/node/atom.py
index 45fdff0..1bfbb77 100644
--- a/smnp/ast/node/atom.py
+++ b/smnp/ast/node/atom.py
@@ -44,15 +44,7 @@ class TypeLiteral(Atom):
 
 
 def IntegerParser(input):
-    return Parser.oneOf(
-        Parser.terminal(TokenType.INTEGER, lambda val, pos: IntegerLiteral.withValue(int(val), pos)),
-        Parser.allOf(
-            Parser.terminal(TokenType.MINUS),
-            Parser.terminal(TokenType.INTEGER, lambda val, pos: IntegerLiteral.withValue(int(val), pos)),
-            createNode=lambda minus, integer: IntegerLiteral.withValue(-integer.value, minus.pos),
-            name="negative integer"
-        )
-    )(input)
+    return Parser.terminal(TokenType.INTEGER, createNode=IntegerLiteral.withValue)(input)
 
 
 def StringParser(input):
diff --git a/smnp/token/tokenizer.py b/smnp/token/tokenizer.py
index 0caa830..9495dee 100644
--- a/smnp/token/tokenizer.py
+++ b/smnp/token/tokenizer.py
@@ -8,7 +8,7 @@ from smnp.token.tokenizers.note import noteTokenizer
 from smnp.token.tokenizers.relation import relationOperatorTokenizer
 from smnp.token.tokenizers.string import stringTokenizer
 from smnp.token.tokenizers.whitespace import whitespacesTokenizer
-from smnp.token.tools import defaultTokenizer, separated, regexPatternTokenizer
+from smnp.token.tools import defaultTokenizer, separated, regexPatternTokenizer, mapValue
 from smnp.token.type import TokenType
 
 tokenizers = (
@@ -39,7 +39,7 @@ tokenizers = (
     defaultTokenizer(TokenType.DOT),
 
     # Types
-    separated(regexPatternTokenizer(TokenType.INTEGER, r'\d')),
+    mapValue(separated(regexPatternTokenizer(TokenType.INTEGER, r'\d')), int),
     stringTokenizer,
     noteTokenizer,
     boolTokenizer,
diff --git a/smnp/token/tools.py b/smnp/token/tools.py
index d6ac7ad..297a278 100644
--- a/smnp/token/tools.py
+++ b/smnp/token/tools.py
@@ -50,3 +50,14 @@ def separated(tokenizer, end=r"\W"):
         return (0, None)
 
     return separated
+
+
+def mapValue(tokenizer, mapper):
+    def tokenize(input, current, line):
+        consumedChars, token = tokenizer(input, current, line)
+        if consumedChars > 0:
+            return (consumedChars, Token(token.type, mapper(token.value), token.pos))
+
+        return (0, None)
+
+    return tokenize