diff --git a/clang/lib/Format/UnwrappedLineParser.cpp b/clang/lib/Format/UnwrappedLineParser.cpp
--- a/clang/lib/Format/UnwrappedLineParser.cpp
+++ b/clang/lib/Format/UnwrappedLineParser.cpp
@@ -3544,7 +3544,8 @@
       switch (FormatTok->Previous->Tok.getKind()) {
       case tok::coloncolon:  // Nested identifier.
       case tok::ampamp:      // Start of a function or variable for the
-      case tok::pipepipe:    // constraint expression.
+      case tok::pipepipe:    // constraint expression. (binary)
+      case tok::exclaim:     // The same as above, but unary.
       case tok::kw_requires: // Initial identifier of a requires clause.
       case tok::equal:       // Initial identifier of a concept declaration.
         break;
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
@@ -24217,6 +24217,15 @@
                "concept DelayedCheck = false || requires(T t) { t.bar(); } && "
                "sizeof(T) <= 8;");
 
+  verifyFormat("template <typename T>\n"
+               "concept DelayedCheck = Unit<T> && !DerivedUnit<T>;");
+
+  verifyFormat("template <typename T>\n"
+               "concept DelayedCheck = Unit<T> && !(DerivedUnit<T>);");
+
+  verifyFormat("template <typename T>\n"
+               "concept DelayedCheck = Unit<T> && !!DerivedUnit<T>;");
+
   verifyFormat("template <typename T>\n"
                "concept DelayedCheck = !!false || requires(T t) { t.bar(); } "
                "&& sizeof(T) <= 8;");
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
@@ -374,6 +374,13 @@
   EXPECT_TOKEN(Tokens[13], tok::ampamp, TT_BinaryOperator);
   EXPECT_TOKEN(Tokens[16], tok::ampamp, TT_BinaryOperator);
 
+  Tokens = annotate("template <typename T>\n"
+                    "concept C = Foo && !Bar;");
+
+  ASSERT_EQ(Tokens.size(), 14u) << Tokens;
+  EXPECT_TOKEN(Tokens[9], tok::ampamp, TT_BinaryOperator);
+  EXPECT_TOKEN(Tokens[10], tok::exclaim, TT_UnaryOperator);
+
   Tokens = annotate("template <typename T>\n"
                     "concept C = requires(T t) {\n"
                     "  { t.foo() };\n"