diff --git a/clang-tools-extra/clang-tidy/bugprone/SuspiciousMemsetUsageCheck.h b/clang-tools-extra/clang-tidy/bugprone/SuspiciousMemsetUsageCheck.h
--- a/clang-tools-extra/clang-tidy/bugprone/SuspiciousMemsetUsageCheck.h
+++ b/clang-tools-extra/clang-tidy/bugprone/SuspiciousMemsetUsageCheck.h
@@ -25,6 +25,9 @@
       : ClangTidyCheck(Name, Context) {}
   void registerMatchers(ast_matchers::MatchFinder *Finder) override;
   void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+  llvm::Optional<TraversalKind> getCheckTraversalKind() const override {
+    return TK_IgnoreUnlessSpelledInSource;
+  }
 };
 
 } // namespace bugprone
diff --git a/clang-tools-extra/clang-tidy/bugprone/SuspiciousMemsetUsageCheck.cpp b/clang-tools-extra/clang-tidy/bugprone/SuspiciousMemsetUsageCheck.cpp
--- a/clang-tools-extra/clang-tidy/bugprone/SuspiciousMemsetUsageCheck.cpp
+++ b/clang-tools-extra/clang-tidy/bugprone/SuspiciousMemsetUsageCheck.cpp
@@ -35,27 +35,24 @@
           callee(MemsetDecl),
           hasArgument(1, characterLiteral(equals(static_cast<unsigned>('0')))
                              .bind("char-zero-fill")),
-          unless(
-              eachOf(hasArgument(0, anyOf(hasType(pointsTo(isAnyCharacter())),
-                                          hasType(arrayType(hasElementType(
-                                              isAnyCharacter()))))),
-                     isInTemplateInstantiation()))),
+          unless(hasArgument(
+              0, anyOf(hasType(pointsTo(isAnyCharacter())),
+                       hasType(arrayType(hasElementType(isAnyCharacter()))))))),
       this);
 
   // Look for memset with an integer literal in its fill_char argument.
   // Will check if it gets truncated.
-  Finder->addMatcher(callExpr(callee(MemsetDecl),
-                              hasArgument(1, integerLiteral().bind("num-fill")),
-                              unless(isInTemplateInstantiation())),
-                     this);
+  Finder->addMatcher(
+      callExpr(callee(MemsetDecl),
+               hasArgument(1, integerLiteral().bind("num-fill"))),
+      this);
 
   // Look for memset(x, y, 0) as that is most likely an argument swap.
   Finder->addMatcher(
       callExpr(callee(MemsetDecl),
                unless(hasArgument(1, anyOf(characterLiteral(equals(
                                                static_cast<unsigned>('0'))),
-                                           integerLiteral()))),
-               unless(isInTemplateInstantiation()))
+                                           integerLiteral()))))
           .bind("call"),
       this);
 }