diff --git a/gum/backend-arm/gumstalker-arm.c b/gum/backend-arm/gumstalker-arm.c
index 22bebd4ec3..c50633319c 100644
--- a/gum/backend-arm/gumstalker-arm.c
+++ b/gum/backend-arm/gumstalker-arm.c
@@ -6213,13 +6213,6 @@ gum_count_trailing_zeros (guint16 value)
 
 #endif
 
-
-gboolean
-gum_stalker_is_run_on_thread_supported (void)
-{
-  return TRUE;
-}
-
 gboolean
 gum_stalker_run_on_thread (GumStalker * self,
                            GumThreadId thread_id,
diff --git a/gum/backend-arm64/gumstalker-arm64.c b/gum/backend-arm64/gumstalker-arm64.c
index e63febbf2f..42495470cf 100644
--- a/gum/backend-arm64/gumstalker-arm64.c
+++ b/gum/backend-arm64/gumstalker-arm64.c
@@ -5898,12 +5898,6 @@ gum_is_bl_imm (guint32 insn)
 
 #endif
 
-gboolean
-gum_stalker_is_run_on_thread_supported (void)
-{
-  return TRUE;
-}
-
 gboolean
 gum_stalker_run_on_thread (GumStalker * self,
                            GumThreadId thread_id,
diff --git a/gum/backend-mips/gumstalker-mips.c b/gum/backend-mips/gumstalker-mips.c
index 7cf6e69b78..35c2d7b634 100644
--- a/gum/backend-mips/gumstalker-mips.c
+++ b/gum/backend-mips/gumstalker-mips.c
@@ -209,12 +209,6 @@ gum_stalker_iterator_put_callout (GumStalkerIterator * self,
 {
 }
 
-gboolean
-gum_stalker_is_run_on_thread_supported (void)
-{
-  return FALSE;
-}
-
 gboolean
 gum_stalker_run_on_thread (GumStalker * self,
                            GumThreadId thread_id,
diff --git a/gum/backend-x86/gumstalker-x86.c b/gum/backend-x86/gumstalker-x86.c
index 6801e39b68..d238fcb94d 100644
--- a/gum/backend-x86/gumstalker-x86.c
+++ b/gum/backend-x86/gumstalker-x86.c
@@ -6654,12 +6654,6 @@ gum_store_thread_exit_match (GumAddress address,
 
 #endif
 
-gboolean
-gum_stalker_is_run_on_thread_supported (void)
-{
-  return TRUE;
-}
-
 gboolean
 gum_stalker_run_on_thread (GumStalker * self,
                            GumThreadId thread_id,
diff --git a/gum/gumstalker.c b/gum/gumstalker.c
index 306d6e408b..8ea7b407e5 100644
--- a/gum/gumstalker.c
+++ b/gum/gumstalker.c
@@ -432,11 +432,6 @@ gum_stalker_run_on_thread_sync (GumStalker * self,
 {
   RunOnThreadSyncCtx ctx;
 
-  if (!gum_stalker_is_run_on_thread_supported ())
-  {
-    return FALSE;
-  }
-
   if (gum_process_get_current_thread_id () == thread_id)
   {
     return gum_stalker_run_on_thread (self, thread_id, func, user_data);
diff --git a/gum/gumstalker.h b/gum/gumstalker.h
index 2617b8a90c..ff0794dbe5 100644
--- a/gum/gumstalker.h
+++ b/gum/gumstalker.h
@@ -277,8 +277,6 @@ GUM_API void gum_stalker_observer_switch_callback (
     GumStalkerObserver * observer, gpointer from_address,
     gpointer start_address, gpointer from_insn, gpointer * target);
 
-GUM_API gboolean gum_stalker_is_run_on_thread_supported (void);
-
 GUM_API gboolean gum_stalker_run_on_thread (GumStalker * self,
     GumThreadId thread_id, GumStalkerRunOnThreadFunc func, gpointer user_data);
 
diff --git a/tests/core/arch-arm/stalker-arm.c b/tests/core/arch-arm/stalker-arm.c
index 7d3b2e42b8..32211c5cff 100644
--- a/tests/core/arch-arm/stalker-arm.c
+++ b/tests/core/arch-arm/stalker-arm.c
@@ -127,7 +127,6 @@ TESTLIST_BEGIN (stalker)
   TESTENTRY (prefetch)
 #endif
   TESTGROUP_BEGIN ("RunOnThread")
-    TESTENTRY (run_on_thread_support)
     TESTENTRY (run_on_thread_current)
     TESTENTRY (run_on_thread_current_sync)
     TESTENTRY (run_on_thread_other)
@@ -3803,12 +3802,6 @@ prefetch_read_blocks (int fd,
 
 #endif
 
-TESTCASE (run_on_thread_support)
-{
-  gboolean supported = gum_stalker_is_run_on_thread_supported ();
-  g_assert_true (supported);
-}
-
 TESTCASE (run_on_thread_current)
 {
   GumThreadId thread_id = gum_process_get_current_thread_id ();
diff --git a/tests/core/arch-arm64/stalker-arm64.c b/tests/core/arch-arm64/stalker-arm64.c
index 196a9b2757..a25c7cbad3 100644
--- a/tests/core/arch-arm64/stalker-arm64.c
+++ b/tests/core/arch-arm64/stalker-arm64.c
@@ -81,7 +81,6 @@ TESTLIST_BEGIN (stalker)
   TESTENTRY (observer)
 #endif
   TESTGROUP_BEGIN ("RunOnThread")
-    TESTENTRY (run_on_thread_support)
     TESTENTRY (run_on_thread_current)
     TESTENTRY (run_on_thread_current_sync)
     TESTENTRY (run_on_thread_other)
@@ -2421,12 +2420,6 @@ gum_test_stalker_observer_increment_total (GumStalkerObserver * observer)
 
 #endif
 
-TESTCASE (run_on_thread_support)
-{
-  gboolean supported = gum_stalker_is_run_on_thread_supported ();
-  g_assert_true (supported);
-}
-
 TESTCASE (run_on_thread_current)
 {
   GumThreadId thread_id = gum_process_get_current_thread_id ();
diff --git a/tests/core/arch-x86/stalker-x86.c b/tests/core/arch-x86/stalker-x86.c
index 4092cbdbfa..310da79e61 100644
--- a/tests/core/arch-x86/stalker-x86.c
+++ b/tests/core/arch-x86/stalker-x86.c
@@ -121,7 +121,6 @@ TESTLIST_BEGIN (stalker)
   TESTGROUP_END ()
 #endif
   TESTGROUP_BEGIN ("RunOnThread")
-    TESTENTRY (run_on_thread_support)
     TESTENTRY (run_on_thread_current)
     TESTENTRY (run_on_thread_current_sync)
     TESTENTRY (run_on_thread_other)
@@ -3512,12 +3511,6 @@ test_check_followed (void)
 
 #endif
 
-TESTCASE (run_on_thread_support)
-{
-  gboolean supported = gum_stalker_is_run_on_thread_supported ();
-  g_assert_true (supported);
-}
-
 TESTCASE (run_on_thread_current)
 {
   GumThreadId thread_id = gum_process_get_current_thread_id ();