diff --git a/src/parser.rs b/src/parser.rs
index 0bc7ccfa..ec8db86b 100644
--- a/src/parser.rs
+++ b/src/parser.rs
@@ -372,6 +372,7 @@ impl<'a> TokenIterator<'a> {
             match c {
                 '0'...'9' => {
                     let mut result = Vec::new();
+                    let mut radix_base: Option<u32> = None;
                     result.push(c);
 
                     while let Some(&nxt) = self.char_stream.peek() {
@@ -393,10 +394,59 @@ impl<'a> TokenIterator<'a> {
                                     }
                                 }
                             }
+                            'x' | 'X' => {
+                                result.push(nxt);
+                                self.char_stream.next();
+                                while let Some(&nxt_hex) = self.char_stream.peek() {
+                                    match nxt_hex {
+                                        '0'...'9' | 'a'...'f' | 'A'...'F' => {
+                                            result.push(nxt_hex);
+                                            self.char_stream.next();
+                                        }
+                                        _ => break,
+                                    }
+                                }
+                                radix_base = Some(16);
+                            }
+                            'o' | 'O' => {
+                                result.push(nxt);
+                                self.char_stream.next();
+                                while let Some(&nxt_oct) = self.char_stream.peek() {
+                                    match nxt_oct {
+                                        '0'...'8' => {
+                                            result.push(nxt_oct);
+                                            self.char_stream.next();
+                                        }
+                                        _ => break,
+                                    }
+                                }
+                                radix_base = Some(8);
+                            }
+                            'b' | 'B' => {
+                                result.push(nxt);
+                                self.char_stream.next();
+                                while let Some(&nxt_bin) = self.char_stream.peek() {
+                                    match nxt_bin {
+                                        '0' | '1' | '_' => {
+                                            result.push(nxt_bin);
+                                            self.char_stream.next();
+                                        }
+                                        _ => break,
+                                    }
+                                }
+                                radix_base = Some(2);
+                            }
                             _ => break,
                         }
                     }
 
+                    if let Some(radix) = radix_base {
+                        let out: String = result.iter().cloned().skip(2).filter(|c| c != &'_').collect();
+                        if let Ok(val) = i64::from_str_radix(&out, radix) {
+                            return Some(Token::IntConst(val));
+                        }
+                    }
+
                     let out: String = result.iter().cloned().collect();
 
                     if let Ok(val) = out.parse::<i64>() {
diff --git a/src/tests.rs b/src/tests.rs
index c19225ef..9ff3fc65 100644
--- a/src/tests.rs
+++ b/src/tests.rs
@@ -690,6 +690,23 @@ fn test_right_shift_equals() {
     }
 }
 
+#[test]
+fn test_hex_literal() {
+    let mut engine = Engine::new();
+
+    if let Ok(result) = engine.eval::<i64>("let x = 0xf; x") {
+        assert_eq!(result, 15);
+    } else {
+        assert!(false);
+    }
+
+    if let Ok(result) = engine.eval::<i64>("let x = 0xff; x") {
+        assert_eq!(result, 255);
+    } else {
+        assert!(false);
+    }
+}
+
 #[test]
 fn test_modulo_equals() {
     let mut engine = Engine::new();
@@ -701,6 +718,40 @@ fn test_modulo_equals() {
     }
 }
 
+#[test]
+fn test_octal_literal() {
+    let mut engine = Engine::new();
+
+    if let Ok(result) = engine.eval::<i64>("let x = 0o77; x") {
+        assert_eq!(result, 63);
+    } else {
+        assert!(false)
+    }
+
+    if let Ok(result) = engine.eval::<i64>("let x = 0o1234; x") {
+        assert_eq!(result, 668);
+    } else {
+        assert!(false);
+    }
+}
+
+#[test]
+fn test_binary_literal() {
+    let mut engine = Engine::new();
+
+    if let Ok(result) = engine.eval::<i64>("let x = 0b1111; x") {
+        assert_eq!(result, 15);
+    } else {
+        assert!(false);
+    }
+
+    if let Ok(result) = engine.eval::<i64>("let x = 0b0011_1100_1010_0101; x") {
+        assert_eq!(result, 15525);
+    } else {
+        assert!(false);
+    }
+}
+
 #[test]
 fn test_binary_ops() {
     let mut engine = Engine::new();