diff --git a/cfg/std.cfg b/cfg/std.cfg
index bdb8dc36a..fe8c92150 100644
--- a/cfg/std.cfg
+++ b/cfg/std.cfg
@@ -1543,6 +1543,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
     <pure/>
     <noreturn>false</noreturn>
     <leak-ignore/>
+    <returnValue type="int">arg1==L' ' || arg1==L'\t'</returnValue>
     <arg nr="1">
       <not-uninit/>
     </arg>
diff --git a/test/cfg/std.c b/test/cfg/std.c
index 300674530..20a9125ba 100644
--- a/test/cfg/std.c
+++ b/test/cfg/std.c
@@ -3692,8 +3692,9 @@ void invalidPrintfArgType_printf(void)
 void valueFlow(void)
 {
     const char abc[] = "abc";
-    int three = 3, minusThree = -3;
-    int c0='0', ca='a', blank=' ', tab='\t';
+    const int three = 3, minusThree = -3;
+    const int c0='0', ca='a', blank=' ', tab='\t';
+    const wint_t wblank=L' ', wtab=L'\t', w0=L'0';
 
     // When adding functions below, please sort alphabetically.
 
@@ -3713,6 +3714,14 @@ void valueFlow(void)
     AssertAlwaysTrue(isdigit(c0) == 1);
     // cppcheck-suppress knownConditionTrueFalse
     AssertAlwaysTrue(isdigit(ca) == 0);
+
+    // cppcheck-suppress knownConditionTrueFalse
+    AssertAlwaysTrue(iswblank(wblank) == 1);
+    // cppcheck-suppress knownConditionTrueFalse
+    AssertAlwaysTrue(iswblank(wtab) == 1);
+    // cppcheck-suppress knownConditionTrueFalse
+    AssertAlwaysTrue(iswblank(w0) == 0);
+
     // cppcheck-suppress knownConditionTrueFalse
     AssertAlwaysTrue(labs(three) == 3);
     // cppcheck-suppress knownConditionTrueFalse
diff --git a/test/cfg/std.cpp b/test/cfg/std.cpp
index b9a02a217..4494d81e0 100644
--- a/test/cfg/std.cpp
+++ b/test/cfg/std.cpp
@@ -3218,6 +3218,6 @@ void stdalgorithm(const std::list<int> &ints1, const std::list<int> &ints2)
 
     // <!-- Function std::for_each(InputIterator first, InputIterator last, Function func) -->
     // cppcheck-suppress mismatchingContainers
-    std::for_each(ints1.begin(), ints2.end(), [](int i){});
+    std::for_each(ints1.begin(), ints2.end(), [](int i) {});
 
 }