diff --git a/example/example-mdbx.c b/example/example-mdbx.c
index 0e6148d9..215a0fca 100644
--- a/example/example-mdbx.c
+++ b/example/example-mdbx.c
@@ -94,8 +94,8 @@ int main(int argc, char *argv[]) {
     fprintf(stderr, "mdbx_env_create: (%d) %s\n", rc, mdbx_strerror(rc));
     goto bailout;
   }
-  rc = mdbx_env_open(env, "./example-db",
-                     MDBX_NOSUBDIR | MDBX_COALESCE | MDBX_LIFORECLAIM, 0664);
+  rc = mdbx_env_open(env, "./example-db", MDBX_NOSUBDIR | MDBX_LIFORECLAIM,
+                     0664);
   if (rc != MDBX_SUCCESS) {
     fprintf(stderr, "mdbx_env_open: (%d) %s\n", rc, mdbx_strerror(rc));
     goto bailout;
diff --git a/mdbx.h b/mdbx.h
index eac303fa..79cf025f 100644
--- a/mdbx.h
+++ b/mdbx.h
@@ -1327,8 +1327,9 @@ enum MDBX_env_flags_t {
    * This flag may be changed at any time using `mdbx_env_set_flags()`. */
   MDBX_NOMEMINIT = UINT32_C(0x1000000),
 
+#ifndef _MSC_VER /* avoid madness MSVC */
   /** Aims to coalesce a Garbage Collection items.
-   * \note Always enabled since v0.12
+   * \deprecated Always enabled since v0.12 and deprecated since v0.13.
    *
    * With `MDBX_COALESCE` flag MDBX will aims to coalesce items while recycling
    * a Garbage Collection. Technically, when possible short lists of pages
@@ -1338,7 +1339,8 @@ enum MDBX_env_flags_t {
    * Unallocated space and reducing the database file.
    *
    * This flag may be changed at any time using mdbx_env_set_flags(). */
-  MDBX_COALESCE = UINT32_C(0x2000000),
+  MDBX_COALESCE MDBX_DEPRECATED = UINT32_C(0x2000000),
+#endif /* avoid madness MSVC */
 
   /** LIFO policy for recycling a Garbage Collection items.
    *
diff --git a/src/internals.h b/src/internals.h
index f5213d85..64bf7355 100644
--- a/src/internals.h
+++ b/src/internals.h
@@ -1784,8 +1784,8 @@ log2n_powerof2(size_t value_uintptr) {
  * environment and re-opening it with the new flags. */
 #define ENV_CHANGEABLE_FLAGS                                                   \
   (MDBX_SAFE_NOSYNC | MDBX_NOMETASYNC | MDBX_DEPRECATED_MAPASYNC |             \
-   MDBX_NOMEMINIT | MDBX_COALESCE | MDBX_PAGEPERTURB | MDBX_ACCEDE |           \
-   MDBX_VALIDATION)
+   MDBX_NOMEMINIT | MDBX_DEPRECATED_COALESCE | MDBX_PAGEPERTURB |              \
+   MDBX_ACCEDE | MDBX_VALIDATION)
 #define ENV_CHANGELESS_FLAGS                                                   \
   (MDBX_NOSUBDIR | MDBX_RDONLY | MDBX_WRITEMAP | MDBX_NOSTICKYTHREADS |        \
    MDBX_NORDAHEAD | MDBX_LIFORECLAIM | MDBX_EXCLUSIVE)
diff --git a/src/mdbx.c++ b/src/mdbx.c++
index 51a0f35f..8f4e740d 100644
--- a/src/mdbx.c++
+++ b/src/mdbx.c++
@@ -1227,7 +1227,7 @@ env::operate_parameters::make_flags(bool accede, bool use_subdirectory) const {
     if (options.nested_write_transactions)
       flags &= ~MDBX_WRITEMAP;
     if (reclaiming.coalesce)
-      flags |= MDBX_COALESCE;
+      flags |= MDBX_env_flags_t(MDBX_DEPRECATED_COALESCE);
     if (reclaiming.lifo)
       flags |= MDBX_LIFORECLAIM;
     switch (durability) {
@@ -1272,7 +1272,7 @@ env::durability env::operate_parameters::durability_from_flags(
 
 env::reclaiming_options::reclaiming_options(MDBX_env_flags_t flags) noexcept
     : lifo((flags & MDBX_LIFORECLAIM) ? true : false),
-      coalesce((flags & MDBX_COALESCE) ? true : false) {}
+      coalesce((flags & MDBX_DEPRECATED_COALESCE) ? true : false) {}
 
 env::operate_options::operate_options(MDBX_env_flags_t flags) noexcept
     : no_sticky_threads(((flags & (MDBX_NOSTICKYTHREADS | MDBX_EXCLUSIVE)) ==
diff --git a/test/extra/dupfixed_addodd.c b/test/extra/dupfixed_addodd.c
index da9ba944..5b666af9 100644
--- a/test/extra/dupfixed_addodd.c
+++ b/test/extra/dupfixed_addodd.c
@@ -37,8 +37,8 @@ int main() {
     exit(EXIT_FAILURE);
   }
 
-  rc = mdbx_env_open(env, "./example-db",
-                     MDBX_NOSUBDIR | MDBX_COALESCE | MDBX_LIFORECLAIM, 0664);
+  rc = mdbx_env_open(env, "./example-db", MDBX_NOSUBDIR | MDBX_LIFORECLAIM,
+                     0664);
   if (rc != MDBX_SUCCESS) {
     fprintf(stderr, "mdbx_env_open: (%d) %s\n", rc, mdbx_strerror(rc));
     exit(EXIT_FAILURE);
diff --git a/test/extra/upsert_alldups.c b/test/extra/upsert_alldups.c
index 702cdb82..7999f081 100644
--- a/test/extra/upsert_alldups.c
+++ b/test/extra/upsert_alldups.c
@@ -62,8 +62,7 @@ int main(int argc, const char *argv[]) {
     errmsg = "failed to mdbx_env_create: %s\n";
     goto Fail;
   }
-  if ((rc = mdbx_env_open(
-           env, ".", MDBX_NOSUBDIR | MDBX_COALESCE | MDBX_LIFORECLAIM, 0644))) {
+  if ((rc = mdbx_env_open(env, ".", MDBX_NOSUBDIR | MDBX_LIFORECLAIM, 0644))) {
     errmsg = "failed to mdbx_env_open: %s\n";
     goto Fail;
   }