diff --git a/Contrib/Makensisw/makensisw.cpp b/Contrib/Makensisw/makensisw.cpp
index d9e420fc..e61b5c6a 100644
--- a/Contrib/Makensisw/makensisw.cpp
+++ b/Contrib/Makensisw/makensisw.cpp
@@ -216,6 +216,8 @@ BOOL CALLBACK DialogProc(HWND hwndDlg, UINT msg, WPARAM wParam, LPARAM lParam) {
           ResetObjects();
           CompileNSISScript();
         }
+      } else {
+        MessageBox(hwndDlg,MULTIDROPERROR,"Error",MB_OK|MB_ICONSTOP);
       }
       break;
     }
diff --git a/Contrib/Makensisw/makensisw.h b/Contrib/Makensisw/makensisw.h
index 7dadff84..a88a6089 100644
--- a/Contrib/Makensisw/makensisw.h
+++ b/Contrib/Makensisw/makensisw.h
@@ -43,6 +43,7 @@
 #define NSISERROR    "Unable to intialize MakeNSIS.  Please verify that makensis.exe is in the same directory as makensisw.exe."
 #define DLGERROR     "Unable to intialize MakeNSISW."
 #define SYMBOLSERROR "Symbol cannot contain whitespace characters"
+#define MULTIDROPERROR "Dropping more than one script at a time is not supported"
 #define NSISUPDATEPROMPT "Running NSIS Update will close MakeNSISW.\nContinue?"
 #define REGSEC       HKEY_LOCAL_MACHINE
 #define REGKEY       "Software\\NSIS"