diff --git a/cfg/std.cfg b/cfg/std.cfg
index 74b22abe4..ad7150404 100644
--- a/cfg/std.cfg
+++ b/cfg/std.cfg
@@ -6819,6 +6819,52 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
       <not-uninit/>
     </arg>
   </function>
+  <!-- void std::ofstream::open(const std::string & filename, ios_base::openmode mode = ios_base::out); -->
+  <function name="std::ofstream::open">
+    <noreturn>false</noreturn>
+    <leak-ignore/>
+    <returnValue type="void"/>
+    <arg nr="1" direction="in"/>
+    <arg nr="2" direction="in" default="std::ios_base::out">
+      <not-uninit/>
+    </arg>
+  </function>
+  <!-- void std::ifstream::open(const char* filename, ios_base::openmode mode = ios_base::in); -->
+  <!-- void std::ifstream::open(const std::string & filename, ios_base::openmode mode = ios_base::in); -->
+  <function name="std::ifstream::open">
+    <noreturn>false</noreturn>
+    <leak-ignore/>
+    <returnValue type="void"/>
+    <arg nr="1" direction="in"/>
+    <arg nr="2" direction="in" default="std::ios_base::in">
+      <not-uninit/>
+    </arg>
+  </function>
+  <!-- void std::fstream::open(const char* filename, ios_base::openmode mode = ios_base::in | ios_base::out); -->
+  <!-- void std::fstream::open(const std::string& filename, ios_base::openmode mode = ios_base::in | ios_base::out); -->
+  <function name="std::fstream::open">
+    <noreturn>false</noreturn>
+    <leak-ignore/>
+    <returnValue type="void"/>
+    <arg nr="1" direction="in"/>
+    <arg nr="2" direction="in" default="std::ios_base::in | std::ios_base::out">
+      <not-uninit/>
+    </arg>
+  </function>
+  <!-- std::filebuf* std::filebuf::open (const char* filename,  ios_base::openmode mode); -->
+  <!-- std::filebuf* std::filebuf::open (const string filename, ios_base::openmode mode);-->
+  <function name="std::filebuf::open">
+    <noreturn>false</noreturn>
+    <leak-ignore/>
+    <use-retval/>
+    <returnValue type="std::filebuf *"/>
+    <arg nr="1" direction="in">
+      <not-uninit/>
+    </arg>
+    <arg nr="2" direction="in">
+      <not-uninit/>
+    </arg>
+  </function>
   <!-- void reserve (size_t n = 0); -->
   <function name="std::string::reserve,std::wstring::reserve,std::basic_string::reserve">
     <noreturn>false</noreturn>