diff --git a/Modules/main.c b/Modules/main.c
index fcd9330..7ff4908 100644
--- a/Modules/main.c
+++ b/Modules/main.c
@@ -577,7 +577,6 @@
     if ((p = Py_GETENV("PYTHONEXECUTABLE")) && *p != '\0') {
         wchar_t* buffer;
         size_t len = strlen(p);
-        size_t r;
 
         buffer = malloc(len * sizeof(wchar_t));
         if (buffer == NULL) {
@@ -585,7 +584,7 @@
                "not enough memory to copy PYTHONEXECUTABLE");
         }
 
-        r = mbstowcs(buffer, p, len);
+        mbstowcs(buffer, p, len);
         Py_SetProgramName(buffer);
         /* buffer is now handed off - do not free */
     } else {