diff --git a/libcextract/Passes.cpp b/libcextract/Passes.cpp
index 115cd93..d701af2 100644
--- a/libcextract/Passes.cpp
+++ b/libcextract/Passes.cpp
@@ -79,7 +79,7 @@ static bool Build_ASTUnit(PassManager::Context *ctx, IntrusiveRefCntPtr<vfs::Fil
   PCHContainerOps = std::make_shared<PCHContainerOperations>();
 
   auto AU = ASTUnit::LoadFromCompilerInvocation(
-      CInvok, PCHContainerOps, Diags, FileMgr, false, CaptureDiagsKind::None, 1,
+      CInvok, PCHContainerOps, Diags, FileMgr, false, CaptureDiagsKind::None, 0,
       TU_Complete, false, false, false);
 
   if (AU == nullptr) {
diff --git a/testsuite/includes/pch-1.c b/testsuite/includes/pch-1.c
new file mode 100644
index 0000000..830ca79
--- /dev/null
+++ b/testsuite/includes/pch-1.c
@@ -0,0 +1,13 @@
+/* { dg-options "-DCE_EXTRACT_FUNCTIONS=main -DCE_NO_EXTERNALIZATION" }*/
+
+#include "pch-1.h"
+
+DEFINE_FUNCTION;
+
+int main()
+{
+  function_0();
+  return 0;
+}
+
+/* { dg-final { scan-tree-dump "function_0" } } */
diff --git a/testsuite/includes/pch-1.h b/testsuite/includes/pch-1.h
new file mode 100644
index 0000000..6654d1f
--- /dev/null
+++ b/testsuite/includes/pch-1.h
@@ -0,0 +1,12 @@
+#define __DEFINE_FUNCTION(i) \
+  int function_ ## i (void) { \
+    return 0;\
+  }
+
+#define _DEFINE_FUNCTION(i) \
+  __DEFINE_FUNCTION(i)
+
+#define DEFINE_FUNCTION \
+  _DEFINE_FUNCTION(__COUNTER__)
+
+DEFINE_FUNCTION;