diff --git a/nxscript.c b/nxscript.c
index f7a50fcf..a97178d2 100644
--- a/nxscript.c
+++ b/nxscript.c
@@ -1065,7 +1065,7 @@ static int handlePut(SConnection *pCon, SicsInterp *pSics, pNXScript self,
     }
     if(strlen(defString) < 900){
       strcat(defString," -dim {");
-      sprintf(numBuf,"%ld",strlen(buffer)+1);
+      sprintf(numBuf,"%d",(int)strlen(buffer)+1);
       strcat(defString,numBuf);
       strcat(defString," }");
     } else {