diff --git a/cfg/std.cfg b/cfg/std.cfg
index 3d41a9b48..74ca9c6d4 100644
--- a/cfg/std.cfg
+++ b/cfg/std.cfg
@@ -6023,6 +6023,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
     <use-retval/>
     <noreturn>false</noreturn>
     <leak-ignore/>
+    <pure/>
     <returnValue>arg1&lt;arg2?arg1:arg2</returnValue>
     <arg nr="1" direction="in">
       <not-uninit/>
@@ -6036,6 +6037,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
     <use-retval/>
     <noreturn>false</noreturn>
     <leak-ignore/>
+    <pure/>
     <returnValue>arg1&gt;arg2?arg1:arg2</returnValue>
     <arg nr="1" direction="in">
       <not-uninit/>