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
@@ -3537,7 +3537,8 @@
       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
@@ -24109,6 +24109,15 @@
                "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;");