diff --git a/clang-tools-extra/clangd/Compiler.cpp b/clang-tools-extra/clangd/Compiler.cpp
--- a/clang-tools-extra/clangd/Compiler.cpp
+++ b/clang-tools-extra/clangd/Compiler.cpp
@@ -78,6 +78,8 @@
   CI->getPreprocessorOpts().PCHThroughHeader.clear();
   CI->getPreprocessorOpts().PCHWithHdrStop = false;
   CI->getPreprocessorOpts().PCHWithHdrStopCreate = false;
+  // Don't crash on `#pragma clang __debug parser_crash`
+  CI->getPreprocessorOpts().DisablePragmaDebugCrash = true;
 
   // Recovery expression currently only works for C++.
   if (CI->getLangOpts()->CPlusPlus) {
diff --git a/clang-tools-extra/clangd/unittests/CompilerTests.cpp b/clang-tools-extra/clangd/unittests/CompilerTests.cpp
--- a/clang-tools-extra/clangd/unittests/CompilerTests.cpp
+++ b/clang-tools-extra/clangd/unittests/CompilerTests.cpp
@@ -51,6 +51,11 @@
               IsEmpty());
 }
 
+TEST(BuildCompilerInvocation, PragmaDebugCrash) {
+  TestTU TU = TestTU::withCode("#pragma clang __debug parser_crash");
+  TU.build(); // no-crash
+}
+
 } // namespace
 } // namespace clangd
 } // namespace clang