diff --git a/.gitignore b/.gitignore
index 1b664050..e407d9c4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,6 +8,9 @@
 *.orig
 *.rej
 *.so
+*.dll
+*.dylib
+*.dSYM
 *[~#]
 .idea
 .le.ini
diff --git a/ChangeLog.md b/ChangeLog.md
index 1ddb5d30..2a1238f9 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -30,10 +30,10 @@ New features:
 
 Fixes:
 
- - Fixed 4-byte aligned access to 64-bit integers.
  - Fixed missing cleanup (null assigned) in the C++ commit/abort (https://github.com/erthink/libmdbx/pull/143).
  - Fixed `mdbx_realloc()` for case of nullptr and `MDBX_AVOID_CRT=ON` for Windows.
  - Fixed the possibility to use invalid and renewed (closed & re-opened, dropped & re-created) DBI-handles (https://github.com/erthink/libmdbx/issues/146).
+ - Fixed 4-byte aligned access to 64-bit integers, including access to the `bootid` meta-page's field (https://github.com/erthink/libmdbx/issues/153).
 
 
 ## v0.9.2 scheduled at 2020-11-27
diff --git a/GNUmakefile b/GNUmakefile
index 34d40681..b065078b 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -72,7 +72,7 @@ strip: all
 	strip libmdbx.$(SO_SUFFIX) $(TOOLS)
 
 clean:
-	rm -rf $(TOOLS) mdbx_test @* *.[ao] *.[ls]o *~ tmp.db/* \
+	rm -rf $(TOOLS) mdbx_test @* *.[ao] *.[ls]o *.$(SO_SUFFIX) *.dSYM *~ tmp.db/* \
 		*.gcov *.log *.err src/*.o test/*.o mdbx_example dist \
 		config.h src/config.h src/version.c *.tar*
 
diff --git a/mdbx.h b/mdbx.h
index e4ae65cd..7fe1464d 100644
--- a/mdbx.h
+++ b/mdbx.h
@@ -823,7 +823,7 @@ DEFINE_ENUM_FLAG_OPERATORS(MDBX_debug_flags_t)
  * \param [in] env  An environment handle returned by \ref mdbx_env_create().
  * \param [in] msg  The assertion message, not including newline. */
 typedef void MDBX_debug_func(MDBX_log_level_t loglevel, const char *function,
-                             int line, const char *msg,
+                             int line, const char *fmt,
                              va_list args) MDBX_CXX17_NOEXCEPT;
 
 /** \brief The "don't change `logger`" value for mdbx_setup_debug() */
diff --git a/src/core.c b/src/core.c
index 51fec3e5..8fe79d12 100644
--- a/src/core.c
+++ b/src/core.c
@@ -4415,7 +4415,7 @@ bailout:
 /*----------------------------------------------------------------------------*/
 
 static __always_inline bool meta_bootid_match(const MDBX_meta *meta) {
-  return meta->mm_bootid.x == bootid.x && meta->mm_bootid.y == bootid.y &&
+  return memcmp(&meta->mm_bootid, &bootid, 16) == 0 &&
          (bootid.x | bootid.y) != 0;
 }
 
@@ -4467,7 +4467,7 @@ static __inline void mdbx_meta_update_end(const MDBX_env *env, MDBX_meta *meta,
   mdbx_assert(env, unaligned_peek_u64(4, meta->mm_txnid_b) < txnid);
   (void)env;
   mdbx_jitter4testing(true);
-  meta->mm_bootid = bootid;
+  memcpy(&meta->mm_bootid, &bootid, 16);
   unaligned_poke_u64(4, meta->mm_txnid_b, txnid);
 }
 
@@ -4477,7 +4477,7 @@ static __inline void mdbx_meta_set_txnid(const MDBX_env *env, MDBX_meta *meta,
   (void)env;
   /* update inconsistent since this function used ONLY for filling meta-image
    * for writing, but not the actual meta-page */
-  meta->mm_bootid = bootid;
+  memcpy(&meta->mm_bootid, &bootid, 16);
   unaligned_poke_u64(4, meta->mm_txnid_a, txnid);
   unaligned_poke_u64(4, meta->mm_txnid_b, txnid);
 }
@@ -17328,12 +17328,9 @@ __cold int mdbx_env_info_ex(const MDBX_env *env, const MDBX_txn *txn,
     arg->mi_meta2_txnid = mdbx_meta_txnid_fluid(env, meta2);
     arg->mi_meta2_sign = unaligned_peek_u64(4, meta2->mm_datasync_sign);
     if (likely(bytes > size_before_bootid)) {
-      arg->mi_bootid.meta0.x = meta0->mm_bootid.x;
-      arg->mi_bootid.meta1.x = meta0->mm_bootid.x;
-      arg->mi_bootid.meta2.x = meta0->mm_bootid.x;
-      arg->mi_bootid.meta0.y = meta0->mm_bootid.y;
-      arg->mi_bootid.meta1.y = meta0->mm_bootid.y;
-      arg->mi_bootid.meta2.y = meta0->mm_bootid.y;
+      memcpy(&arg->mi_bootid.meta0, &meta0->mm_bootid, 16);
+      memcpy(&arg->mi_bootid.meta1, &meta1->mm_bootid, 16);
+      memcpy(&arg->mi_bootid.meta2, &meta2->mm_bootid, 16);
     }
 
     const MDBX_meta *txn_meta = recent_meta;