diff --git a/ethchain/asm.go b/ethchain/asm.go
index d46e46af7..492be0999 100644
--- a/ethchain/asm.go
+++ b/ethchain/asm.go
@@ -21,9 +21,10 @@ func Disassemble(script []byte) (asm []string) {
 		asm = append(asm, fmt.Sprintf("%v", op))
 
 		switch op {
-		case oPUSH32: // Push PC+1 on to the stack
+		case oPUSH1, oPUSH2, oPUSH3, oPUSH4, oPUSH5, oPUSH6, oPUSH7, oPUSH8, oPUSH9, oPUSH10, oPUSH11, oPUSH12, oPUSH13, oPUSH14, oPUSH15, oPUSH16, oPUSH17, oPUSH18, oPUSH19, oPUSH20, oPUSH21, oPUSH22, oPUSH23, oPUSH24, oPUSH25, oPUSH26, oPUSH27, oPUSH28, oPUSH29, oPUSH30, oPUSH31, oPUSH32:
 			pc.Add(pc, ethutil.Big1)
-			data := script[pc.Int64() : pc.Int64()+32]
+			a := int64(op) - int64(oPUSH1) + 1
+			data := script[pc.Int64() : pc.Int64()+a]
 			val := ethutil.BigD(data)
 
 			var b []byte
@@ -35,7 +36,7 @@ func Disassemble(script []byte) (asm []string) {
 
 			asm = append(asm, fmt.Sprintf("0x%x", b))
 
-			pc.Add(pc, big.NewInt(31))
+			pc.Add(pc, big.NewInt(a-1))
 		}
 
 		pc.Add(pc, ethutil.Big1)