diff --git a/Source/g_game.c b/Source/g_game.c
index b917dff1..b904b5ac 100644
--- a/Source/g_game.c
+++ b/Source/g_game.c
@@ -1276,7 +1276,7 @@ static void G_DoSaveGame(void)
   Z_CheckHeap();
 
   if (!M_WriteFile(name, savebuffer, length))
-    dprintf(errno ? strerror(errno) : "Could not save game: Error unknown");
+    dprintf("%s", errno ? strerror(errno) : "Could not save game: Error unknown");
   else
     players[consoleplayer].message = s_GGSAVED;  // Ty 03/27/98 - externalized
 
diff --git a/Source/m_misc.c b/Source/m_misc.c
index db351fac..e2417c46 100644
--- a/Source/m_misc.c
+++ b/Source/m_misc.c
@@ -2399,7 +2399,7 @@ void M_ScreenShot (void)
   // players[consoleplayer].message = "screen shot"
 
   // killough 10/98: print error message and change sound effect if error
-  S_StartSound(NULL, !success ? dprintf(errno ? strerror(errno) :
+  S_StartSound(NULL, !success ? dprintf("%s", errno ? strerror(errno) :
 					"Could not take screenshot"), sfx_oof :
                gamemode==commercial ? sfx_radio : sfx_tink);