Index: clang-tidy/modernize/RedundantVoidArgCheck.cpp
===================================================================
--- clang-tidy/modernize/RedundantVoidArgCheck.cpp
+++ clang-tidy/modernize/RedundantVoidArgCheck.cpp
@@ -116,9 +116,12 @@
     const MatchFinder::MatchResult &Result, const FunctionDecl *Function) {
   SourceLocation Start = Function->getLocStart();
   if (Function->isThisDeclarationADefinition()) {
-    SourceLocation BeforeBody =
-        Function->getBody()->getLocStart().getLocWithOffset(-1);
-    removeVoidArgumentTokens(Result, SourceRange(Start, BeforeBody),
+    SourceLocation End;
+    if (Function->hasBody())
+      End = Function->getBody()->getLocStart().getLocWithOffset(-1);
+    else
+      End = Function->getLocEnd();
+    removeVoidArgumentTokens(Result, SourceRange(Start, End),
                              "function definition");
   } else {
     removeVoidArgumentTokens(Result, Function->getSourceRange(),
Index: test/clang-tidy/modernize-redundant-void-arg.cpp
===================================================================
--- test/clang-tidy/modernize-redundant-void-arg.cpp
+++ test/clang-tidy/modernize-redundant-void-arg.cpp
@@ -433,3 +433,9 @@
 F(Foo, Bar) {
 
 }
+
+struct DefinitionWithNoBody {
+  DefinitionWithNoBody(void) = delete;
+  // CHECK-MESSAGES: :[[@LINE-1]]:24: warning: {{.*}} in function definition
+  // CHECK-FIXES: DefinitionWithNoBody() = delete;
+};