diff --git a/cfg/std.cfg b/cfg/std.cfg
index c934a3215..17a37a375 100644
--- a/cfg/std.cfg
+++ b/cfg/std.cfg
@@ -157,6 +157,7 @@
     <leak-ignore/>
     <arg nr="1" direction="in">
       <not-uninit/>
+      <valid>1.0:</valid>
     </arg>
   </function>
   <!-- float acoshf(float x); -->
@@ -168,6 +169,7 @@
     <leak-ignore/>
     <arg nr="1" direction="in">
       <not-uninit/>
+      <valid>1.0:</valid>
     </arg>
   </function>
   <!-- long double acoshl(long double x); -->
@@ -179,6 +181,7 @@
     <leak-ignore/>
     <arg nr="1" direction="in">
       <not-uninit/>
+      <valid>1.0:</valid>
     </arg>
   </function>
   <!-- char *asctime(const struct tm *tm) -->