diff --git a/lib/script/opcode.js b/lib/script/opcode.js
index 2b71a19d..e732dce1 100644
--- a/lib/script/opcode.js
+++ b/lib/script/opcode.js
@@ -125,6 +125,7 @@ Opcode.prototype.fromReader = function fromReader(br) {
   if (op >= 0x01 && op <= 0x4b) {
     if (br.left() < op) {
       this.value = -1;
+      br.seek(br.left());
       return this;
     }
     this.value = op;
@@ -141,6 +142,7 @@ Opcode.prototype.fromReader = function fromReader(br) {
       size = br.readU8();
       if (br.left() < size) {
         this.value = -1;
+        br.seek(br.left());
         break;
       }
       this.value = op;
@@ -149,11 +151,13 @@ Opcode.prototype.fromReader = function fromReader(br) {
     case opcodes.OP_PUSHDATA2:
       if (br.left() < 2) {
         this.value = -1;
+        br.seek(br.left());
         break;
       }
       size = br.readU16();
       if (br.left() < size) {
         this.value = -1;
+        br.seek(br.left());
         break;
       }
       this.value = op;
@@ -162,11 +166,13 @@ Opcode.prototype.fromReader = function fromReader(br) {
     case opcodes.OP_PUSHDATA4:
       if (br.left() < 4) {
         this.value = -1;
+        br.seek(br.left());
         break;
       }
       size = br.readU32();
       if (br.left() < size) {
         this.value = -1;
+        br.seek(br.left());
         break;
       }
       this.value = op;