diff --git a/src/hb-common.cc b/src/hb-common.cc
index 37be8a34e..28b0c2b82 100644
--- a/src/hb-common.cc
+++ b/src/hb-common.cc
@@ -276,7 +276,7 @@ struct hb_language_item_t {
 
 static hb_atomic_ptr_t <hb_language_item_t> langs;
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
 static void
 free_langs (void)
 {
@@ -323,7 +323,7 @@ retry:
     goto retry;
   }
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
   if (!first_lang)
     atexit (free_langs); /* First person registers atexit() callback. */
 #endif
@@ -780,7 +780,7 @@ parse_uint32 (const char **pp, const char *end, uint32_t *pv)
 
 #ifdef USE_XLOCALE
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
 static void free_static_C_locale (void);
 #endif
 
@@ -791,7 +791,7 @@ static struct hb_C_locale_lazy_loader_t : hb_lazy_loader_t<hb_remove_pointer<HB_
   {
     HB_LOCALE_T C_locale = HB_CREATE_LOCALE ("C");
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
     atexit (free_static_C_locale);
 #endif
 
@@ -807,7 +807,7 @@ static struct hb_C_locale_lazy_loader_t : hb_lazy_loader_t<hb_remove_pointer<HB_
   }
 } static_C_locale;
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
 static
 void free_static_C_locale (void)
 {
diff --git a/src/hb-ft.cc b/src/hb-ft.cc
index 9b9d787de..fff0e285a 100644
--- a/src/hb-ft.cc
+++ b/src/hb-ft.cc
@@ -478,7 +478,7 @@ hb_ft_get_font_h_extents (hb_font_t *font HB_UNUSED,
   return true;
 }
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
 static void free_static_ft_funcs (void);
 #endif
 
@@ -504,7 +504,7 @@ static struct hb_ft_font_funcs_lazy_loader_t : hb_font_funcs_lazy_loader_t<hb_ft
 
     hb_font_funcs_make_immutable (funcs);
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
     atexit (free_static_ft_funcs);
 #endif
 
@@ -512,7 +512,7 @@ static struct hb_ft_font_funcs_lazy_loader_t : hb_font_funcs_lazy_loader_t<hb_ft
   }
 } static_ft_funcs;
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
 static
 void free_static_ft_funcs (void)
 {
@@ -744,7 +744,7 @@ hb_ft_font_create_referenced (FT_Face ft_face)
   return hb_ft_font_create (ft_face, _hb_ft_face_destroy);
 }
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
 static void free_static_ft_library (void);
 #endif
 
@@ -757,7 +757,7 @@ static struct hb_ft_library_lazy_loader_t : hb_lazy_loader_t<hb_remove_pointer<F
     if (FT_Init_FreeType (&l))
       return nullptr;
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
     atexit (free_static_ft_library);
 #endif
 
@@ -773,7 +773,7 @@ static struct hb_ft_library_lazy_loader_t : hb_lazy_loader_t<hb_remove_pointer<F
   }
 } static_ft_library;
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
 static
 void free_static_ft_library (void)
 {
diff --git a/src/hb-glib.cc b/src/hb-glib.cc
index 23a0d89c8..cb7e7096e 100644
--- a/src/hb-glib.cc
+++ b/src/hb-glib.cc
@@ -336,7 +336,7 @@ hb_glib_unicode_decompose (hb_unicode_funcs_t *ufuncs HB_UNUSED,
 }
 
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
 static void free_static_glib_funcs (void);
 #endif
 
@@ -355,7 +355,7 @@ static struct hb_glib_unicode_funcs_lazy_loader_t : hb_unicode_funcs_lazy_loader
 
     hb_unicode_funcs_make_immutable (funcs);
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
     atexit (free_static_glib_funcs);
 #endif
 
@@ -363,7 +363,7 @@ static struct hb_glib_unicode_funcs_lazy_loader_t : hb_unicode_funcs_lazy_loader
   }
 } static_glib_funcs;
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
 static
 void free_static_glib_funcs (void)
 {
diff --git a/src/hb-icu.cc b/src/hb-icu.cc
index 12864677c..4e51eb019 100644
--- a/src/hb-icu.cc
+++ b/src/hb-icu.cc
@@ -300,7 +300,7 @@ hb_icu_unicode_decompose (hb_unicode_funcs_t *ufuncs HB_UNUSED,
 }
 
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
 static void free_static_icu_funcs (void);
 #endif
 
@@ -326,7 +326,7 @@ static struct hb_icu_unicode_funcs_lazy_loader_t : hb_unicode_funcs_lazy_loader_
 
     hb_unicode_funcs_make_immutable (funcs);
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
     atexit (free_static_icu_funcs);
 #endif
 
@@ -334,7 +334,7 @@ static struct hb_icu_unicode_funcs_lazy_loader_t : hb_unicode_funcs_lazy_loader_
   }
 } static_icu_funcs;
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
 static
 void free_static_icu_funcs (void)
 {
diff --git a/src/hb-ot-font.cc b/src/hb-ot-font.cc
index b19b25a3e..7c9136250 100644
--- a/src/hb-ot-font.cc
+++ b/src/hb-ot-font.cc
@@ -243,7 +243,7 @@ hb_ot_get_font_v_extents (hb_font_t *font,
   return vmtx.has_font_extents;
 }
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
 static void free_static_ot_funcs (void);
 #endif
 
@@ -269,7 +269,7 @@ static struct hb_ot_font_funcs_lazy_loader_t : hb_font_funcs_lazy_loader_t<hb_ot
 
     hb_font_funcs_make_immutable (funcs);
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
     atexit (free_static_ot_funcs);
 #endif
 
@@ -277,7 +277,7 @@ static struct hb_ot_font_funcs_lazy_loader_t : hb_font_funcs_lazy_loader_t<hb_ot
   }
 } static_ot_funcs;
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
 static
 void free_static_ot_funcs (void)
 {
diff --git a/src/hb-shape.cc b/src/hb-shape.cc
index 270da3d77..45f3a6916 100644
--- a/src/hb-shape.cc
+++ b/src/hb-shape.cc
@@ -48,7 +48,7 @@
  **/
 
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
 static void free_static_shaper_list (void);
 #endif
 
@@ -69,7 +69,7 @@ static struct hb_shaper_list_lazy_loader_t : hb_lazy_loader_t<const char *,
       shaper_list[i] = shapers[i].name;
     shaper_list[i] = nullptr;
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
     atexit (free_static_shaper_list);
 #endif
 
@@ -85,7 +85,7 @@ static struct hb_shaper_list_lazy_loader_t : hb_lazy_loader_t<const char *,
   }
 } static_shaper_list;
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
 static
 void free_static_shaper_list (void)
 {
diff --git a/src/hb-shaper.cc b/src/hb-shaper.cc
index abea544f8..b10927ecf 100644
--- a/src/hb-shaper.cc
+++ b/src/hb-shaper.cc
@@ -35,7 +35,7 @@ static const hb_shaper_entry_t all_shapers[] = {
 #undef HB_SHAPER_IMPLEMENT
 };
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
 static void free_static_shapers (void);
 #endif
 
@@ -80,7 +80,7 @@ static struct hb_shapers_lazy_loader_t : hb_lazy_loader_t<const hb_shaper_entry_
 	p = end + 1;
     }
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
     atexit (free_static_shapers);
 #endif
 
@@ -96,7 +96,7 @@ static struct hb_shapers_lazy_loader_t : hb_lazy_loader_t<const hb_shaper_entry_
   }
 } static_shapers;
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
 static
 void free_static_shapers (void)
 {
diff --git a/src/hb-ucdn.cc b/src/hb-ucdn.cc
index 3179683c2..10608aff5 100644
--- a/src/hb-ucdn.cc
+++ b/src/hb-ucdn.cc
@@ -222,7 +222,7 @@ hb_ucdn_decompose(hb_unicode_funcs_t *ufuncs HB_UNUSED,
 }
 
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
 static void free_static_ucdn_funcs (void);
 #endif
 
@@ -241,7 +241,7 @@ static struct hb_ucdn_unicode_funcs_lazy_loader_t : hb_unicode_funcs_lazy_loader
 
     hb_unicode_funcs_make_immutable (funcs);
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
     atexit (free_static_ucdn_funcs);
 #endif
 
@@ -249,7 +249,7 @@ static struct hb_ucdn_unicode_funcs_lazy_loader_t : hb_unicode_funcs_lazy_loader
   }
 } static_ucdn_funcs;
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
 static
 void free_static_ucdn_funcs (void)
 {
diff --git a/src/hb-uniscribe.cc b/src/hb-uniscribe.cc
index 1331704e9..1fae6435b 100644
--- a/src/hb-uniscribe.cc
+++ b/src/hb-uniscribe.cc
@@ -245,7 +245,7 @@ static struct hb_uniscribe_shaper_funcs_lazy_loader_t : hb_lazy_loader_t<hb_unis
 
     funcs->init ();
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
     atexit (free_static_uniscribe_shaper_funcs);
 #endif
 
@@ -261,7 +261,7 @@ static struct hb_uniscribe_shaper_funcs_lazy_loader_t : hb_lazy_loader_t<hb_unis
   }
 } static_uniscribe_shaper_funcs;
 
-#ifdef HB_USE_ATEXIT
+#if HB_USE_ATEXIT
 static
 void free_static_uniscribe_shaper_funcs (void)
 {
diff --git a/src/hb.hh b/src/hb.hh
index 16ccf87ce..8c12b91cc 100644
--- a/src/hb.hh
+++ b/src/hb.hh
@@ -281,7 +281,7 @@ static int errno = 0; /* Use something better? */
 #  endif
 #endif
 
-#if HAVE_ATEXIT
+#if defined(HAVE_ATEXIT) && !defined(HB_USE_ATEXIT)
 /* atexit() is only safe to be called from shared libraries on certain
  * platforms.  Whitelist.
  * https://bugs.freedesktop.org/show_bug.cgi?id=82246 */
@@ -313,6 +313,9 @@ static int errno = 0; /* Use something better? */
 #ifdef HB_NO_ATEXIT
 #  undef HB_USE_ATEXIT
 #endif
+#ifndef HB_USE_ATEXIT
+#  define HB_USE_ATEXIT 0
+#endif
 
 #define HB_STMT_START do
 #define HB_STMT_END   while (0)