diff --git a/core/vm/analysis.go b/core/vm/analysis.go
index aa853fae28ce4..9a678627aee8d 100644
--- a/core/vm/analysis.go
+++ b/core/vm/analysis.go
@@ -106,26 +106,20 @@ func codeBitmapInternal(code, bits bitvec) bitvec {
 		switch numbits {
 		case 1:
 			bits.set1(pc)
-			pc += 1
 		case 2:
 			bits.setN(set2BitsMask, pc)
-			pc += 2
 		case 3:
 			bits.setN(set3BitsMask, pc)
-			pc += 3
 		case 4:
 			bits.setN(set4BitsMask, pc)
-			pc += 4
 		case 5:
 			bits.setN(set5BitsMask, pc)
-			pc += 5
 		case 6:
 			bits.setN(set6BitsMask, pc)
-			pc += 6
 		case 7:
 			bits.setN(set7BitsMask, pc)
-			pc += 7
 		}
+		pc += uint64(numbits)
 	}
 	return bits
 }