Index: clang-tidy/readability/UppercaseLiteralSuffixCheck.cpp
===================================================================
--- clang-tidy/readability/UppercaseLiteralSuffixCheck.cpp
+++ clang-tidy/readability/UppercaseLiteralSuffixCheck.cpp
@@ -198,7 +198,8 @@
   Finder->addMatcher(
       stmt(allOf(eachOf(integerLiteral().bind(IntegerLiteralCheck::Name),
                         floatLiteral().bind(FloatingLiteralCheck::Name)),
-                 unless(anyOf(hasParent(userDefinedLiteral()),
+                 unless(anyOf(hasAncestor(isImplicit()),
+                              hasParent(userDefinedLiteral()),
                               hasParent(substNonTypeTemplateParmExpr()))))),
       this);
 }
Index: test/clang-tidy/readability-uppercase-literal-suffix-integer.cpp
===================================================================
--- test/clang-tidy/readability-uppercase-literal-suffix-integer.cpp
+++ test/clang-tidy/readability-uppercase-literal-suffix-integer.cpp
@@ -251,3 +251,9 @@
 void actual_template_test() {
   template_test<4>();
 }
+
+const int table[6] = {};
+void read_test() {
+  for (auto i : table) {
+  }
+}