diff --git a/src/script.h b/src/script.h
index 4c3dacb..a401620 100755
--- a/src/script.h
+++ b/src/script.h
@@ -437,7 +437,7 @@ class CScript : public std::vector<unsigned char>
         // Immediate operand
         if (opcode <= OP_PUSHDATA4)
         {
-            unsigned int nSize;
+            unsigned int nSize = 0;
             if (opcode < OP_PUSHDATA1)
             {
                 nSize = opcode;