diff --git a/cfg/posix.cfg b/cfg/posix.cfg
index f07f8fe8b..7cde306a3 100644
--- a/cfg/posix.cfg
+++ b/cfg/posix.cfg
@@ -2197,7 +2197,7 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
     <leak-ignore/>
     <use-retval/>
     <returnValue type="long int"/>
-    <arg nr="1" direction="in">
+    <arg nr="1" direction="inout">
       <not-null/>
       <not-uninit/>
       <not-bool/>
@@ -2209,7 +2209,7 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
     <leak-ignore/>
     <use-retval/>
     <returnValue type="long int"/>
-    <arg nr="1" direction="in">
+    <arg nr="1" direction="inout">
       <not-null/>
       <not-uninit/>
       <not-bool/>
@@ -2221,7 +2221,7 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
     <leak-ignore/>
     <use-retval/>
     <returnValue type="double"/>
-    <arg nr="1" direction="in">
+    <arg nr="1" direction="inout">
       <not-null/>
       <not-uninit/>
       <not-bool/>
diff --git a/test/cfg/posix.c b/test/cfg/posix.c
index 3da495953..0621e9836 100644
--- a/test/cfg/posix.c
+++ b/test/cfg/posix.c
@@ -330,6 +330,13 @@ double nullPointer_erand48(unsigned short xsubi[3])
     return erand48(xsubi);
 }
 
+struct non_const_parameter_erand48_struct { unsigned short xsubi[3]; };
+// No warning is expected that dat can be const
+double non_const_parameter_erand48(struct non_const_parameter_erand48_struct *dat)
+{
+    return erand48(dat->xsubi);
+}
+
 unsigned short *nullPointer_seed48(unsigned short seed16v[3])
 {
     // cppcheck-suppress nullPointer