diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -1883,6 +1883,25 @@
         LeftOfParens = LeftOfParens->MatchingParen->Previous;
       }
 
+      if (LeftOfParens->is(tok::r_square)) {
+        //   delete[] (void *)ptr;
+        auto MayBeArrayDelete = [](FormatToken *Tok) -> FormatToken * {
+          if (Tok->isNot(tok::r_square))
+            return nullptr;
+
+          Tok = Tok->getPreviousNonComment();
+          if (!Tok || Tok->isNot(tok::l_square))
+            return nullptr;
+
+          Tok = Tok->getPreviousNonComment();
+          if (!Tok || Tok->isNot(tok::kw_delete))
+            return nullptr;
+          return Tok;
+        };
+        if (FormatToken *MaybeDelete = MayBeArrayDelete(LeftOfParens))
+          LeftOfParens = MaybeDelete;
+      }
+
       // The Condition directly below this one will see the operator arguments
       // as a (void *foo) cast.
       //   void operator delete(void *foo) ATTRIB;
@@ -3227,7 +3246,10 @@
       if (Left.isOneOf(tok::kw_try, Keywords.kw___except, tok::kw_catch))
         return Style.SpaceBeforeParensOptions.AfterControlStatements ||
                spaceRequiredBeforeParens(Right);
-      if (Left.isOneOf(tok::kw_new, tok::kw_delete))
+      if (Left.isOneOf(tok::kw_new, tok::kw_delete) ||
+          (Left.is(tok::r_square) && Left.MatchingParen &&
+           Left.MatchingParen->Previous &&
+           Left.MatchingParen->Previous->is(tok::kw_delete)))
         return Style.SpaceBeforeParens != FormatStyle::SBPO_Never ||
                spaceRequiredBeforeParens(Right);
     }
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -9744,6 +9744,7 @@
                "    new (aaaaaaaaaaaaaaaaaaaaaaaaaa(aaaaaaaaaaaaaaaaaaaaaaa))\n"
                "        typename aaaaaaaaaaaaaaaaaaaaaaaa();");
   verifyFormat("delete[] h->p;");
+  verifyFormat("delete[] (void *)p;");
 
   verifyFormat("void operator delete(void *foo) ATTRIB;");
   verifyFormat("void operator new(void *foo) ATTRIB;");
diff --git a/clang/unittests/Format/TokenAnnotatorTest.cpp b/clang/unittests/Format/TokenAnnotatorTest.cpp
--- a/clang/unittests/Format/TokenAnnotatorTest.cpp
+++ b/clang/unittests/Format/TokenAnnotatorTest.cpp
@@ -97,6 +97,28 @@
   EXPECT_TOKEN(Tokens[4], tok::l_brace, TT_Unknown);
 }
 
+TEST_F(TokenAnnotatorTest, UnderstandsDelete) {
+  auto Tokens = annotate("delete (void *)p;");
+  EXPECT_EQ(Tokens.size(), 8u) << Tokens;
+  EXPECT_TOKEN(Tokens[4], tok::r_paren, TT_CastRParen);
+
+  Tokens = annotate("delete[] (void *)p;");
+  EXPECT_EQ(Tokens.size(), 10u) << Tokens;
+  EXPECT_TOKEN(Tokens[6], tok::r_paren, TT_CastRParen);
+
+  Tokens = annotate("delete[] /*comment*/ (void *)p;");
+  EXPECT_EQ(Tokens.size(), 11u) << Tokens;
+  EXPECT_TOKEN(Tokens[7], tok::r_paren, TT_CastRParen);
+
+  Tokens = annotate("delete[/*comment*/] (void *)p;");
+  EXPECT_EQ(Tokens.size(), 11u) << Tokens;
+  EXPECT_TOKEN(Tokens[7], tok::r_paren, TT_CastRParen);
+
+  Tokens = annotate("delete/*comment*/[] (void *)p;");
+  EXPECT_EQ(Tokens.size(), 11u) << Tokens;
+  EXPECT_TOKEN(Tokens[7], tok::r_paren, TT_CastRParen);
+}
+
 } // namespace
 } // namespace format
 } // namespace clang