diff --git a/compiler/lexer/lexer.go b/compiler/lexer/lexer.go
index b795b84..7bbceb4 100644
--- a/compiler/lexer/lexer.go
+++ b/compiler/lexer/lexer.go
@@ -11,6 +11,7 @@ const (
 	IDENTIFIER lexType = iota
 	KEYWORD
 	NUMBER
+	HEX
 	STRING
 	BYTE
 	OPERATOR
@@ -238,9 +239,30 @@ func Lex(inputFullSource string) []Item {
 			// NUMBER
 			// 0-9
 			lexNumber := func() bool {
+				isHex := false
+				if i + 1 < len(input) {
+					if input[i] == '0' && input[i+1] == 'x' {
+						isHex = true
+						i += 2
+					}
+				}
 				if i >= len(input) {
 					return false
 				}
+				if isHex {
+					if (input[i] >= '0' && input[i] <= '9') || (input[i] >= 'a' && input[i] <= 'f') || (input[i] >= 'A' && input[i] <= 'F') {
+						val := ""
+						for (input[i] >= '0' && input[i] <= '9') || (input[i] >= 'a' && input[i] <= 'f') || (input[i] >= 'A' && input[i] <= 'F') {
+							val += string(input[i])
+							i++
+							if i >= len(input) {
+								break
+							}
+						}
+						res = append(res, Item{Type: HEX, Val: val, Line: line})
+						return true
+					}
+				}
 				if input[i] >= '0' && input[i] <= '9' {
 					val := ""
 					for i < len(input) && input[i] >= '0' && input[i] <= '9' {
diff --git a/compiler/parser/parser.go b/compiler/parser/parser.go
index ae37d15..cfaf010 100644
--- a/compiler/parser/parser.go
+++ b/compiler/parser/parser.go
@@ -63,6 +63,33 @@ func (p *parser) parseOne(withAheadParse bool) (res Node) {
 	return p.parseOneWithOptions(withAheadParse, withAheadParse, withAheadParse)
 }
 
+func (p *parser) parseNumberSuffix() (ty TypeNode) {
+	next := p.lookAhead(1)
+	if next.Type == lexer.IDENTIFIER {
+		switch next.Val {
+		case "u8":
+			ty = &SingleTypeNode{SourceName: "uint8", TypeName: "uint8"}
+			p.i++
+		case "u16":
+			ty = &SingleTypeNode{SourceName: "uint16", TypeName: "uint16"}
+			p.i++
+		case "u32":
+			ty = &SingleTypeNode{SourceName: "uint32", TypeName: "uint32"}
+			p.i++
+		case "u64":
+			ty = &SingleTypeNode{SourceName: "uint64", TypeName: "uint64"}
+			p.i++
+		case "u128":
+			ty = &SingleTypeNode{SourceName: "uint128", TypeName: "uint128"}
+			p.i++
+		case "u256":
+			ty = &SingleTypeNode{SourceName: "uint256", TypeName: "uint256"}
+			p.i++
+		}
+	}
+	return
+}
+
 func (p *parser) parseOneWithOptions(withAheadParse, withArithAhead, withIdentifierAhead bool) (res Node) {
 	current := p.input[p.i]
 
@@ -91,6 +118,24 @@ func (p *parser) parseOneWithOptions(withAheadParse, withArithAhead, withIdentif
 		}
 		return
 
+
+	// HEX always returns a ConstantNode
+	// Convert string hex representation to int64
+	case lexer.HEX:
+		val, err := strconv.ParseInt(current.Val, 16, 64)
+		if err != nil {
+			panic(err)
+		}
+		res = &ConstantNode{
+			Type:       NUMBER,
+			TargetType: p.parseNumberSuffix(),
+			Value:      val,
+		}
+		if withAheadParse {
+			res = p.aheadParse(res)
+		}
+		return
+
 	// NUMBER always returns a ConstantNode
 	// Convert string representation to int64
 	case lexer.NUMBER:
@@ -98,34 +143,10 @@ func (p *parser) parseOneWithOptions(withAheadParse, withArithAhead, withIdentif
 		if err != nil {
 			panic(err)
 		}
-		next := p.lookAhead(1)
-		var ty TypeNode
-		if next.Type == lexer.IDENTIFIER {
-			switch next.Val {
-			case "u8":
-				ty = &SingleTypeNode{SourceName: "uint8", TypeName: "uint8"}
-				p.i++
-			case "u16":
-				ty = &SingleTypeNode{SourceName: "uint16", TypeName: "uint16"}
-				p.i++
-			case "u32":
-				ty = &SingleTypeNode{SourceName: "uint32", TypeName: "uint32"}
-				p.i++
-			case "u64":
-				ty = &SingleTypeNode{SourceName: "uint64", TypeName: "uint64"}
-				p.i++
-			case "u128":
-				ty = &SingleTypeNode{SourceName: "uint128", TypeName: "uint128"}
-				p.i++
-			case "u256":
-				ty = &SingleTypeNode{SourceName: "uint256", TypeName: "uint256"}
-				p.i++
-			}
-		}
 
 		res = &ConstantNode{
 			Type:       NUMBER,
-			TargetType: ty,
+			TargetType: p.parseNumberSuffix(),
 			Value:      val,
 		}
 		if withAheadParse {
diff --git a/tests/examples/number-literal.cell b/tests/examples/number-literal.cell
index 4e87c89..934a0ea 100644
--- a/tests/examples/number-literal.cell
+++ b/tests/examples/number-literal.cell
@@ -27,5 +27,10 @@ func main() {
 	if f != uint256(600) {
 		return 6
 	}
+
+	aa := 0xffffu32
+	if aa != uint32(65535) {
+		return 11
+	}
 	return 0
 }
\ No newline at end of file