diff --git a/lexer/lexer_test.go b/lexer/lexer_test.go
index 1d1b175..4a6fc96 100644
--- a/lexer/lexer_test.go
+++ b/lexer/lexer_test.go
@@ -91,6 +91,10 @@ func TestTokenizeAll (test *testing.T) {
 
 func TestTokenizeNumbers (test *testing.T) {
 	checkTokenSlice("../tests/lexer/numbers.arf", []Token {
+		Token { kind: TokenKindUInt, value: uint64(0) },
+		Token { kind: TokenKindNewline },
+		Token { kind: TokenKindUInt, value: uint64(5) },
+		Token { kind: TokenKindNewline },
 		Token { kind: TokenKindUInt, value: uint64(83628266) },
 		Token { kind: TokenKindNewline },
 		Token { kind: TokenKindUInt, value: uint64(83628266) },
diff --git a/tests/lexer/numbers.arf b/tests/lexer/numbers.arf
index 9e512ca..e0da9bb 100644
--- a/tests/lexer/numbers.arf
+++ b/tests/lexer/numbers.arf
@@ -1,4 +1,5 @@
 :arf
+0
 83628266
 0b100111111000001000011101010
 0x4Fc10Ea