Index: clang-tools-extra/clang-tidy/modernize/RedundantVoidArgCheck.cpp
===================================================================
--- clang-tools-extra/clang-tidy/modernize/RedundantVoidArgCheck.cpp
+++ clang-tools-extra/clang-tidy/modernize/RedundantVoidArgCheck.cpp
@@ -109,9 +109,13 @@
     }
     removeVoidArgumentTokens(Result, SourceRange(Start, End),
                              "function definition");
-  } else
+  } else if (!Function->getLexicalDeclContext()->isFunctionOrMethod()) {
+    // Only do this if our decl context is outside of a function or method;
+    // otherwise, the user may have explicitly written `(void)` to avoid Most
+    // Vexing Parse warnings.
     removeVoidArgumentTokens(Result, SourceRange(Start, End),
                              "function declaration");
+  }
 }
 
 bool isMacroIdentifier(const IdentifierTable &Idents, const Token &ProtoToken) {
Index: clang-tools-extra/test/clang-tidy/checkers/modernize/redundant-void-arg.cpp
===================================================================
--- clang-tools-extra/test/clang-tidy/checkers/modernize/redundant-void-arg.cpp
+++ clang-tools-extra/test/clang-tidy/checkers/modernize/redundant-void-arg.cpp
@@ -592,3 +592,9 @@
   (void)a;
 }
 #undef return_t
+
+// Explicitly specifying `(void)` is a way to sidestep -Wvexing-parse, so we
+// should not warn about it here.
+void most_vexing_parse() {
+  int foo(void);
+}