diff --git a/src/tool_operate.c b/src/tool_operate.c
index 96c7ac745e7ab1..13d3fc5ded9df7 100644
--- a/src/tool_operate.c
+++ b/src/tool_operate.c
@@ -319,7 +319,7 @@ static CURLcode pre_transfer(struct GlobalConfig *global,
       }
       return CURLE_READ_ERROR;
     }
-    per->infdopen = isstdin;
+    per->infdopen = !isstdin;
 
     /* we ignore file size for char/block devices, sockets, etc. */
     if(S_ISREG(fileinfo.st_mode))