diff --git a/lang/src/tokeniser.asm b/lang/src/tokeniser.asm
index 46fb908..ea17760 100644
--- a/lang/src/tokeniser.asm
+++ b/lang/src/tokeniser.asm
@@ -323,6 +323,7 @@ is_ident:
     push r13
     push r14
     push rdi
+
     mov rax, [rel cursor]
     mov r12, [rel buffer]
     mov r13, [rel buffer_len]
@@ -393,7 +394,7 @@ is_number:
     mov dil, [r12 + r14]
     call is_whitespace
     test rax, rax
-    je .number
+    jne .number
     cmp dil, '_'
     je .loop_next
     call is_numeric
@@ -572,4 +573,5 @@ find_lexeme:
 .is_number:
     mov rdi, [rsp + 8]
     mov qword [rdi], TOKEN_NUMBER
+    mov [rdi + 16], rax
     jmp .epilogue
diff --git a/lang/tests/tokens.rs b/lang/tests/tokens.rs
index 1cf89a8..724187f 100644
--- a/lang/tests/tokens.rs
+++ b/lang/tests/tokens.rs
@@ -158,6 +158,18 @@ fn main() {
             Lexeme(10, ""),
             Lexeme(23, ""),
             Lexeme(20, ""),
+        ]);
+
+        eprint!("Initializing tokeniser.. ");
+        tokeniser_init(c"tests/tokens/number.l".as_ptr());
+        eprintln!("ok.");
+
+        assert_eq!(&collect_tokens()[..], &[
+            Lexeme(31, "1234"),
+            Lexeme(31, "123_345_"),
+            Lexeme(31, "1234____56"),
+            Lexeme(31, "1"),
+            Lexeme(31, "0"),
             ]);
 
         eprintln!("Finished tokenising.");
diff --git a/lang/tests/tokens/number.l b/lang/tests/tokens/number.l
new file mode 100644
index 0000000..2a655ee
--- /dev/null
+++ b/lang/tests/tokens/number.l
@@ -0,0 +1,5 @@
+1234
+123_345_
+1234____56
+1
+0