--- a/proto_xboard.cc
+++ b/proto_xboard.cc
@@ -1084,7 +1084,7 @@
   snprintf(EngineCommandLine,512,"crafty bookpath=%s logpath=%s tbpath=%s",
 	   BookPath,LogPath,LogPath);
   if (!global.env.Home.empty())
-    snprintf(EngineRunDir,512,"%s/.eboard/craftylog",global.env.Home.c_str());
+    snprintf(EngineRunDir, sizeof(EngineRunDir), "%s/.eboard/craftylog", global.env.Home.c_str());
   else
     strcpy(EngineRunDir,"/tmp");
 
--- a/util.cc
+++ b/util.cc
@@ -783,7 +783,7 @@
   int i,n;
   char cmd[1024];
 
-  n = snprintf(tmpfile,1024,"/tmp/eb%d-%s",(int) getpid(), origfile);
+  n = snprintf(tmpfile, sizeof(tmpfile), "/tmp/eb%d-%s", (int) getpid(), origfile);
 
   if (n >= 1024) {
     failure = 1;