Index: clang-tidy/readability/RedundantStringCStrCheck.cpp
===================================================================
--- clang-tidy/readability/RedundantStringCStrCheck.cpp
+++ clang-tidy/readability/RedundantStringCStrCheck.cpp
@@ -66,11 +66,11 @@
 }
 
 const char StringConstructor[] =
-    "::std::basic_string<char, std::char_traits<char>, std::allocator<char> >"
+    "::std::basic_string<.*, std::char_traits<.*>, std::allocator<.*> >"
     "::basic_string";
 
 const char StringCStrMethod[] =
-    "::std::basic_string<char, std::char_traits<char>, std::allocator<char> >"
+    "::std::basic_string<.*, std::char_traits<.*>, std::allocator<.*> >"
     "::c_str";
 
 } // end namespace
@@ -89,18 +89,18 @@
   const auto StringConstructorExpr = expr(anyOf(
       cxxConstructExpr(
           argumentCountIs(1),
-          hasDeclaration(cxxMethodDecl(hasName(StringConstructor)))),
+          hasDeclaration(cxxMethodDecl(matchesName(StringConstructor)))),
       cxxConstructExpr(
           argumentCountIs(2),
-          hasDeclaration(cxxMethodDecl(hasName(StringConstructor))),
+          hasDeclaration(cxxMethodDecl(matchesName(StringConstructor))),
           // If present, the second argument is the alloc object which must not
           // be present explicitly.
           hasArgument(1, cxxDefaultArgExpr()))));
 
   // Match a call to the string 'c_str()' method.
-  const auto StringCStrCallExpr = cxxMemberCallExpr(
-                            callee(memberExpr().bind("member")),
-                            callee(cxxMethodDecl(hasName(StringCStrMethod))),
+  const auto StringCStrCallExpr =
+      cxxMemberCallExpr(callee(memberExpr().bind("member")),
+                        callee(cxxMethodDecl(matchesName(StringCStrMethod))),
                             on(expr().bind("arg"))).bind("call");
 
   Finder->addMatcher(
Index: test/clang-tidy/readability-redundant-string-cstr.cpp
===================================================================
--- test/clang-tidy/readability-redundant-string-cstr.cpp
+++ test/clang-tidy/readability-redundant-string-cstr.cpp
@@ -12,7 +12,11 @@
   const C *c_str() const;
 };
 typedef basic_string<char, std::char_traits<char>, std::allocator<char>> string;
+typedef basic_string<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t>> wstring;
+typedef basic_string<char16_t, std::char_traits<char16_t>, std::allocator<char16_t>> u16string;
+typedef basic_string<char32_t, std::char_traits<char32_t>, std::allocator<char32_t>> u32string;
 }
+
 namespace llvm {
 struct StringRef {
   StringRef(const char *p);
@@ -20,6 +24,8 @@
 };
 }
 
+// Tests for std::string.
+
 void f1(const std::string &s) {
   f1(s.c_str());
   // CHECK-MESSAGES: :[[@LINE-1]]:6: warning: redundant call to `c_str()` [readability-redundant-string-cstr]
@@ -39,3 +45,27 @@
   // CHECK-FIXES: {{^  }}std::string s;{{$}}
   // CHECK-FIXES-NEXT: {{^  }}f3(s);{{$}}
 }
+
+// Tests for std::wstring.
+
+void g1(const std::wstring &s) {
+  g1(s.c_str());
+  // CHECK-MESSAGES: :[[@LINE-1]]:6: warning: redundant call to `c_str()` [readability-redundant-string-cstr]
+  // CHECK-FIXES: {{^  }}f1(s);{{$}}
+}
+
+// Tests for std::u16string.
+
+void h1(const std::u16string &s) {
+  h1(s.c_str());
+  // CHECK-MESSAGES: :[[@LINE-1]]:6: warning: redundant call to `c_str()` [readability-redundant-string-cstr]
+  // CHECK-FIXES: {{^  }}f1(s);{{$}}
+}
+
+// Tests for std::u32string.
+
+void k1(const std::u32string &s) {
+  k1(s.c_str());
+  // CHECK-MESSAGES: :[[@LINE-1]]:6: warning: redundant call to `c_str()` [readability-redundant-string-cstr]
+  // CHECK-FIXES: {{^  }}f1(s);{{$}}
+}