diff --git a/src/check-symbols.py b/src/check-symbols.py
index 11ca28dc7..d0b8bd3c8 100755
--- a/src/check-symbols.py
+++ b/src/check-symbols.py
@@ -31,7 +31,7 @@ for soname in ['harfbuzz', 'harfbuzz-subset', 'harfbuzz-icu', 'harfbuzz-gobject'
 		symprefix = '_' if suffix == 'dylib' else ''
 
 		EXPORTED_SYMBOLS = [s.split ()[2]
-				    for s in re.findall (r'^.+ [BCDGIRST] .+$', subprocess.check_output (nm.split() + [so]).decode ('utf-8'), re.MULTILINE)
+				    for s in re.findall (r'^.+ [BCDGIRSTu] .+$', subprocess.check_output (nm.split() + [so]).decode ('utf-8'), re.MULTILINE)
 				    if not re.match (r'.* %s(%s)\b' % (symprefix, IGNORED_SYMBOLS), s)]
 
 		# run again c++filt also if is available
diff --git a/src/hb-subset-accelerator.hh b/src/hb-subset-accelerator.hh
index 34bd0534f..5652db147 100644
--- a/src/hb-subset-accelerator.hh
+++ b/src/hb-subset-accelerator.hh
@@ -33,12 +33,13 @@
 #include "hb-map.hh"
 #include "hb-set.hh"
 
+extern HB_INTERNAL hb_user_data_key_t _hb_subset_accelerator_user_data_key;
+
 struct hb_subset_accelerator_t
 {
   static hb_user_data_key_t* user_data_key()
   {
-    static hb_user_data_key_t key;
-    return &key;
+    return &_hb_subset_accelerator_user_data_key;
   }
 
   static hb_subset_accelerator_t* create(const hb_map_t& unicode_to_gid_,
diff --git a/src/hb-subset.cc b/src/hb-subset.cc
index 6026aa6ef..de9322de3 100644
--- a/src/hb-subset.cc
+++ b/src/hb-subset.cc
@@ -82,6 +82,10 @@ using OT::Layout::GPOS;
  * retain glyph ids option and configure the subset to pass through the layout tables untouched.
  */
 
+
+hb_user_data_key_t _hb_subset_accelerator_user_data_key = {};
+
+
 /*
  * The list of tables in the open type spec. Used to check for tables that may need handling
  * if we are unable to list the tables in a face.