diff --git a/src/3rdparty/win32_src/pdcurses/wingui/pdckbd.c b/src/3rdparty/win32_src/pdcurses/wingui/pdckbd.c
index ce0eecfd1..0e3d11a0e 100644
--- a/src/3rdparty/win32_src/pdcurses/wingui/pdckbd.c
+++ b/src/3rdparty/win32_src/pdcurses/wingui/pdckbd.c
@@ -28,6 +28,8 @@ bool PDC_check_key(void)
        DispatchMessage(&msg);
     }
 
+    Sleep(1); /* otherwise the CPU is pegged */
+
     if( PDC_key_queue_low != PDC_key_queue_high)
         return TRUE;
     return FALSE;