diff --git a/c_src/quicer_nif.c b/c_src/quicer_nif.c
index 5dca270d..aa0fe5fa 100644
--- a/c_src/quicer_nif.c
+++ b/c_src/quicer_nif.c
@@ -21,6 +21,7 @@ limitations under the License.
 #include "quicer_listener.h"
 #include "quicer_vsn.h"
 
+#include <malloc.h>
 #include <openssl/err.h>
 #include <openssl/ssl.h>
 
@@ -1692,6 +1693,16 @@ make_event(ErlNifEnv *env,
                           prop);      // 4th element, event props :: any()) //
 }
 
+ERL_NIF_TERM
+do_malloc_trim(__unused_parm__ ErlNifEnv *env,
+               __unused_parm__ int argc,
+               __unused_parm__ const ERL_NIF_TERM argv[])
+{
+  CXPLAT_FRE_ASSERT(argc == 0);
+  malloc_trim(0);
+  return ATOM_OK;
+}
+
 static ErlNifFunc nif_funcs[] = {
   /* |  name  | arity| funptr | flags|
    *
@@ -1744,6 +1755,7 @@ static ErlNifFunc nif_funcs[] = {
   { "copy_stream_handle", 1, copy_stream_handle, 0},
   /* for testing */
   { "mock_buffer_sig", 3, mock_buffer_sig, 0},
+  { "malloc_trim", 0, do_malloc_trim, 0},
   #ifdef QUICER_USE_SNK
   { "set_snab_kc_pid", 1, set_snab_kc_pid, 0},
   { "get_snab_kc_pid", 0, get_snab_kc_pid, 0},
diff --git a/src/quicer_nif.erl b/src/quicer_nif.erl
index 6d35e00a..e6354de7 100644
--- a/src/quicer_nif.erl
+++ b/src/quicer_nif.erl
@@ -54,6 +54,9 @@
     get_stream_rid/1
 ]).
 
+%% tools
+-export([malloc_trim/0]).
+
 %% For tests only
 -export([
     open_connection/0,
@@ -347,6 +350,10 @@ get_conn_rid(_Handle) ->
 get_stream_rid(_Handle) ->
     erlang:nif_error(nif_library_not_loaded).
 
+-spec malloc_trim() -> ok.
+malloc_trim() ->
+    erlang:nif_error(nif_library_not_loaded).
+
 -spec controlling_process(connection_handle() | stream_handle(), pid()) ->
     ok
     | {error, closed | badarg | owner_dead | not_owner}.
diff --git a/test/quicer_SUITE.erl b/test/quicer_SUITE.erl
index 14c65954..2688b7b1 100644
--- a/test/quicer_SUITE.erl
+++ b/test/quicer_SUITE.erl
@@ -155,6 +155,9 @@
     tc_peercert_server/1,
     tc_peercert_server_nocert/1,
 
+    %% Toolings
+    tc_malloc_trim/1,
+
     %% Versions test
     tc_abi_version/1
     %% testcase to verify env works
@@ -838,10 +841,10 @@ tc_stream_controlling_process_demon(Config) ->
                 end
             ),
             receive
-                {'DOWN', MonRef, process, NewOwner, {Res, Stm}} ->
+                {'DOWN', MonRef, process, OldOwner, {Res, Stm}} ->
                     ct:pal("Set controlling_process res: ~p", [Res])
             end,
-            ?assertEqual({error, owner_dead}, quicer:controlling_process(Stm, NewOwner)),
+            ?assertEqual({error, owner_dead}, quicer:controlling_process(Stm, OldOwner)),
             ok = quicer:setopt(Stm, active, true),
             {ok, _Len} = quicer:send(Stm, <<"owner_changed">>),
             receive
@@ -3193,6 +3196,9 @@ tc_setopt_congestion_control_algorithm(Config) ->
     SPid ! done,
     ok.
 
+tc_malloc_trim(_) ->
+    quicer_nif:malloc_trim().
+
 %%% ====================
 %%% Internal helpers
 %%% ====================