diff --git a/src/script/standard.cpp b/src/script/standard.cpp
index 6c2cfbfbb..91c45c93e 100644
--- a/src/script/standard.cpp
+++ b/src/script/standard.cpp
@@ -143,7 +143,7 @@ bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, vector<vector<unsi
             else if (opcode2 == OP_SMALLDATA)
             {
                 // small pushdata, <= nMaxDatacarrierBytes
-                fprintf(stderr,"size.%d > nMaxDatacarrier.%d\n",vch1.size(),nMaxDatacarrierBytes);
+                fprintf(stderr,"size.%d > nMaxDatacarrier.%d\n",(int32_t)vch1.size(),(int32_t)nMaxDatacarrierBytes);
                 if (vch1.size() > nMaxDatacarrierBytes)
                     break;
             }