diff --git a/clang-tools-extra/clang-tidy/readability/StaticDefinitionInAnonymousNamespaceCheck.cpp b/clang-tools-extra/clang-tidy/readability/StaticDefinitionInAnonymousNamespaceCheck.cpp
--- a/clang-tools-extra/clang-tidy/readability/StaticDefinitionInAnonymousNamespaceCheck.cpp
+++ b/clang-tools-extra/clang-tidy/readability/StaticDefinitionInAnonymousNamespaceCheck.cpp
@@ -17,12 +17,16 @@
 namespace tidy {
 namespace readability {
 
+AST_MATCHER(NamedDecl, isInAnonymousNamespace) {
+  return Node.isInAnonymousNamespace();
+}
+
 void StaticDefinitionInAnonymousNamespaceCheck::registerMatchers(
     MatchFinder *Finder) {
   Finder->addMatcher(
       namedDecl(anyOf(functionDecl(isDefinition(), isStaticStorageClass()),
                       varDecl(isDefinition(), isStaticStorageClass())),
-                hasParent(namespaceDecl(isAnonymous())))
+                isInAnonymousNamespace())
           .bind("static-def"),
       this);
 }
diff --git a/clang-tools-extra/docs/clang-tidy/checks/readability-static-definition-in-anonymous-namespace.rst b/clang-tools-extra/docs/clang-tidy/checks/readability-static-definition-in-anonymous-namespace.rst
--- a/clang-tools-extra/docs/clang-tidy/checks/readability-static-definition-in-anonymous-namespace.rst
+++ b/clang-tools-extra/docs/clang-tidy/checks/readability-static-definition-in-anonymous-namespace.rst
@@ -12,7 +12,10 @@
 
   namespace {
     static int a = 1; // Warning.
-    static const b = 1; // Warning.
+    static const int b = 1; // Warning.
+    namespace inner {
+      static int c = 1; // Warning.
+    }
   }
 
 The check will apply a fix by removing the redundant ``static`` qualifier.
diff --git a/clang-tools-extra/test/clang-tidy/checkers/readability-static-definition-in-anonymous-namespace.cpp b/clang-tools-extra/test/clang-tidy/checkers/readability-static-definition-in-anonymous-namespace.cpp
--- a/clang-tools-extra/test/clang-tidy/checkers/readability-static-definition-in-anonymous-namespace.cpp
+++ b/clang-tools-extra/test/clang-tidy/checkers/readability-static-definition-in-anonymous-namespace.cpp
@@ -36,6 +36,21 @@
 DEFINE_STATIC_VAR(i);
 // CHECK-FIXES: {{^}}DEFINE_STATIC_VAR(i);
 
+namespace inner {
+int a = 1;
+const int b = 1;
+static int c = 1;
+// CHECK-MESSAGES: :[[@LINE-1]]:12: warning: 'c' is a static definition in anonymous namespace; static is redundant here [readability-static-definition-in-anonymous-namespace]
+// CHECK-FIXES: {{^}}int c = 1;
+namespace deep_inner {
+int a = 1;
+const int b = 1;
+static int c = 1;
+// CHECK-MESSAGES: :[[@LINE-1]]:12: warning: 'c' is a static definition in anonymous namespace; static is redundant here [readability-static-definition-in-anonymous-namespace]
+// CHECK-FIXES: {{^}}int c = 1;
+} // namespace deep_inner
+} // namespace inner
+
 } // namespace
 
 namespace N {