diff --git a/dwscr.cc b/dwscr.cc
index ae96235..eacbf66 100644
--- a/dwscr.cc
+++ b/dwscr.cc
@@ -70,11 +70,11 @@ int main(int argc, char * argv[])
 
     /* make the SDL window appear in the top-left corner of the screen */
     if (!windowed)
-        putenv((char *) "SDL_VIDEO_WINDOW_POS=0,0");
+        setenv("SDL_VIDEO_WINDOW_POS", "0,0", 1);
 
     /* do not disable power management (this will allow monitors
      * to power off at the normally configured timeout) */
-    putenv((char *) "SDL_VIDEO_ALLOW_SCREENSAVER=1");
+    setenv("SDL_VIDEO_ALLOW_SCREENSAVER", "1", 1);
 
     if (!start)
         return 0;