diff --git a/cfg/posix.cfg b/cfg/posix.cfg
index 7824c3bc4..bb7bee7d2 100644
--- a/cfg/posix.cfg
+++ b/cfg/posix.cfg
@@ -1231,6 +1231,7 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
   <!-- int strcasecmp(const char *s1, const char *s2); -->
   <function name="strcasecmp">
     <pure/>
+    <use-retval/>
     <noreturn>false</noreturn>
     <leak-ignore/>
     <returnValue type="int"/>
@@ -1247,6 +1248,7 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
   <!-- int strncasecmp(const char *s1, const char *s2, size_t n); -->
   <function name="strncasecmp">
     <pure/>
+    <use-retval/>
     <noreturn>false</noreturn>
     <leak-ignore/>
     <returnValue type="int"/>