diff --git a/core/asm/compiler.go b/core/asm/compiler.go
index 4b1d379206..ce2d23abd0 100644
--- a/core/asm/compiler.go
+++ b/core/asm/compiler.go
@@ -157,12 +157,13 @@ func (c *Compiler) compileLine() error {
 }
 
 // compileNumber compiles the number to bytes
-func (c *Compiler) compileNumber(element token) {
+func (c *Compiler) compileNumber(element token) (int, error) {
 	num := math.MustParseBig256(element.text).Bytes()
 	if len(num) == 0 {
 		num = []byte{0}
 	}
 	c.pushBin(num)
+	return len(num), nil
 }
 
 // compileElement compiles the element (push & label or both)