Fix check_sources_and_headers.
diff --git a/grpc.gemspec b/grpc.gemspec
index d1e8b52..a58c73a 100644
--- a/grpc.gemspec
+++ b/grpc.gemspec
@@ -89,14 +89,11 @@
   s.files += %w( src/core/lib/support/atomic.h )
   s.files += %w( src/core/lib/support/atomic_with_atm.h )
   s.files += %w( src/core/lib/support/atomic_with_std.h )
-  s.files += %w( src/core/lib/support/debug_location.h )
   s.files += %w( src/core/lib/support/env.h )
   s.files += %w( src/core/lib/support/manual_constructor.h )
   s.files += %w( src/core/lib/support/memory.h )
   s.files += %w( src/core/lib/support/mpscq.h )
   s.files += %w( src/core/lib/support/murmur_hash.h )
-  s.files += %w( src/core/lib/support/reference_counted.h )
-  s.files += %w( src/core/lib/support/reference_counted_ptr.h )
   s.files += %w( src/core/lib/support/spinlock.h )
   s.files += %w( src/core/lib/support/stack_lockfree.h )
   s.files += %w( src/core/lib/support/string.h )
@@ -347,6 +344,9 @@
   s.files += %w( src/core/lib/slice/slice_hash_table.h )
   s.files += %w( src/core/lib/slice/slice_internal.h )
   s.files += %w( src/core/lib/slice/slice_string_helpers.h )
+  s.files += %w( src/core/lib/support/debug_location.h )
+  s.files += %w( src/core/lib/support/reference_counted.h )
+  s.files += %w( src/core/lib/support/reference_counted_ptr.h )
   s.files += %w( src/core/lib/support/vector.h )
   s.files += %w( src/core/lib/surface/alarm_internal.h )
   s.files += %w( src/core/lib/surface/api_trace.h )