diff --git a/hphp/runtime/ext/hh/ext_implicit_context.cpp b/hphp/runtime/ext/hh/ext_implicit_context.cpp
index 71726b4268602..fdbac7703bdb8 100644
--- a/hphp/runtime/ext/hh/ext_implicit_context.cpp
+++ b/hphp/runtime/ext/hh/ext_implicit_context.cpp
@@ -220,13 +220,6 @@ bool HHVM_FUNCTION(has_key, StringArg keyArg) {
   return context->m_map.find(key) != context->m_map.end();
 }
 
-bool HHVM_FUNCTION(is_inaccessible) {
-  assertx(*ImplicitContext::activeCtx);
-  auto const obj = *ImplicitContext::activeCtx;
-  auto const context = Native::data<ImplicitContext>(obj);
-  return context->m_memoKey == kAgnosticMemoKey;
-}
-
 String HHVM_FUNCTION(get_state_unsafe) {
   assertx(*ImplicitContext::activeCtx);
   auto const obj = *ImplicitContext::activeCtx;
@@ -354,8 +347,6 @@ static struct HHImplicitContext final : Extension {
                   HHVM_FN(create_implicit_context));
     HHVM_NAMED_FE(HH\\ImplicitContext\\_Private\\get_implicit_context_memo_key,
                   HHVM_FN(get_implicit_context_memo_key));
-    HHVM_NAMED_FE(HH\\ImplicitContext\\is_inaccessible,
-                  HHVM_FN(is_inaccessible));
     HHVM_NAMED_FE(HH\\ImplicitContext\\_Private\\has_key,
                   HHVM_FN(has_key));
     HHVM_NAMED_FE(HH\\ImplicitContext\\_Private\\get_implicit_context_debug_info,
diff --git a/hphp/runtime/ext/hh/ext_implicit_context.php b/hphp/runtime/ext/hh/ext_implicit_context.php
index bc6947f910723..db3f818574be9 100644
--- a/hphp/runtime/ext/hh/ext_implicit_context.php
+++ b/hphp/runtime/ext/hh/ext_implicit_context.php
@@ -70,15 +70,6 @@ enum State: string as string {
 <<__Native>>
 function get_state_unsafe()[zoned]: string /* State */;
 
-/**
- * Returns True if we are in the empty IC state
- * False otherwise
- *
- * Does not affect the state of the IC
- */
-<<__Native>>
-function is_inaccessible()[zoned]: bool;
-
 } // namespace ImplicitContext
 
 namespace ImplicitContext\_Private {
diff --git a/hphp/test/slow/implicit-context/ic-has-key.php b/hphp/test/slow/implicit-context/ic-has-key.php
index b7aae217c039e..698b114a65da7 100644
--- a/hphp/test/slow/implicit-context/ic-has-key.php
+++ b/hphp/test/slow/implicit-context/ic-has-key.php
@@ -9,21 +9,18 @@ function print_state(string $s, bool $b)[zoned]: void {
 function backdoored_fn(): void {
   echo "in backdoored_fn\n";
   print_state('ClassContext::exists', ClassContext::exists());
-  print_state('!HH\ImplicitContext\is_inaccessible', !HH\ImplicitContext\is_inaccessible());
 }
 
 <<__Memoize(#KeyedByIC)>>
 function memo($a, $b)[zoned]: mixed{
   echo "in keyedbyIC memo\n";
   print_state('ClassContext::exists', ClassContext::exists());
-  print_state('!HH\ImplicitContext\is_inaccessible', !HH\ImplicitContext\is_inaccessible());
 }
 
 <<__Memoize>>
 function memo2($a, $b): mixed{
   echo "in default memo\n";
   print_state('ClassContext::exists', ClassContext::exists());
-  print_state('!HH\ImplicitContext\is_inaccessible', !HH\ImplicitContext\is_inaccessible());
 }
 
 function g()[zoned]: mixed{
@@ -34,7 +31,6 @@ function g()[zoned]: mixed{
 function f()[zoned]: mixed{
   echo "in zoned...\n";
   print_state('ClassContext::exists', ClassContext::exists());
-  print_state('!HH\ImplicitContext\is_inaccessible', !HH\ImplicitContext\is_inaccessible());
   memo(1, 3);
   g();
 }
diff --git a/hphp/test/slow/implicit-context/ic-has-key.php.expect b/hphp/test/slow/implicit-context/ic-has-key.php.expect
index e5bc5af8269ce..4c7437f6b456f 100644
--- a/hphp/test/slow/implicit-context/ic-has-key.php.expect
+++ b/hphp/test/slow/implicit-context/ic-has-key.php.expect
@@ -1,12 +1,8 @@
 in zoned...
 ClassContext::exists: True
-!HH\ImplicitContext\is_inaccessible: True
 in keyedbyIC memo
 ClassContext::exists: True
-!HH\ImplicitContext\is_inaccessible: True
 in backdoored_fn
 ClassContext::exists: False
-!HH\ImplicitContext\is_inaccessible: False
 in default memo
 ClassContext::exists: False
-!HH\ImplicitContext\is_inaccessible: False