diff --git a/asio/include/asio/detail/impl/descriptor_ops.ipp b/asio/include/asio/detail/impl/descriptor_ops.ipp
index 9e6d90bc95..c56a512e46 100644
--- a/asio/include/asio/detail/impl/descriptor_ops.ipp
+++ b/asio/include/asio/detail/impl/descriptor_ops.ipp
@@ -69,18 +69,25 @@ int close(int d, state_type& state, asio::error_code& ec)
         ::fcntl(d, F_SETFL, flags & ~O_NONBLOCK);
 #else // defined(__SYMBIAN32__) || defined(__EMSCRIPTEN__)
       ioctl_arg_type arg = 0;
-# if defined(ENOTTY)
+# if defined(ENOTTY) || defined(ENOTCAPABLE)
       result = ::ioctl(d, FIONBIO, &arg);
       get_last_error(ec, result < 0);
-      if (ec.value() == ENOTTY)
+      if (false
+#  if defined(ENOTTY)
+          || ec.value() == ENOTTY
+#  endif // defined(ENOTTY)
+#  if defined(ENOTCAPABLE)
+          || ec.value() == ENOTCAPABLE
+#  endif // defined(ENOTCAPABLE)
+        )
       {
         int flags = ::fcntl(d, F_GETFL, 0);
         if (flags >= 0)
           ::fcntl(d, F_SETFL, flags & ~O_NONBLOCK);
       }
-# else // defined(ENOTTY)
+# else // defined(ENOTTY) || defined(ENOTCAPABLE)
       ::ioctl(d, FIONBIO, &arg);
-# endif // defined(ENOTTY)
+# endif // defined(ENOTTY) || defined(ENOTCAPABLE)
 #endif // defined(__SYMBIAN32__) || defined(__EMSCRIPTEN__)
       state &= ~non_blocking;
 
@@ -114,8 +121,15 @@ bool set_user_non_blocking(int d, state_type& state,
   ioctl_arg_type arg = (value ? 1 : 0);
   int result = ::ioctl(d, FIONBIO, &arg);
   get_last_error(ec, result < 0);
-# if defined(ENOTTY)
-  if (ec.value() == ENOTTY)
+# if defined(ENOTTY) || defined(ENOTCAPABLE)
+  if (false
+#  if defined(ENOTTY)
+      || ec.value() == ENOTTY
+#  endif // defined(ENOTTY)
+#  if defined(ENOTCAPABLE)
+      || ec.value() == ENOTCAPABLE
+#  endif // defined(ENOTCAPABLE)
+    )
   {
     result = ::fcntl(d, F_GETFL, 0);
     get_last_error(ec, result < 0);
@@ -126,7 +140,7 @@ bool set_user_non_blocking(int d, state_type& state,
       get_last_error(ec, result < 0);
     }
   }
-# endif // defined(ENOTTY)
+# endif // defined(ENOTTY) || defined(ENOTCAPABLE)
 #endif // defined(__SYMBIAN32__) || defined(__EMSCRIPTEN__)
 
   if (result >= 0)
@@ -177,8 +191,15 @@ bool set_internal_non_blocking(int d, state_type& state,
   ioctl_arg_type arg = (value ? 1 : 0);
   int result = ::ioctl(d, FIONBIO, &arg);
   get_last_error(ec, result < 0);
-# if defined(ENOTTY)
-  if (ec.value() == ENOTTY)
+# if defined(ENOTTY) || defined(ENOTCAPABLE)
+  if (false
+#  if defined(ENOTTY)
+      || ec.value() == ENOTTY
+#  endif // defined(ENOTTY)
+#  if defined(ENOTCAPABLE)
+      || ec.value() == ENOTCAPABLE
+#  endif // defined(ENOTCAPABLE)
+    )
   {
     result = ::fcntl(d, F_GETFL, 0);
     get_last_error(ec, result < 0);
@@ -189,7 +210,7 @@ bool set_internal_non_blocking(int d, state_type& state,
       get_last_error(ec, result < 0);
     }
   }
-# endif // defined(ENOTTY)
+# endif // defined(ENOTTY) || defined(ENOTCAPABLE)
 #endif // defined(__SYMBIAN32__) || defined(__EMSCRIPTEN__)
 
   if (result >= 0)
diff --git a/asio/include/asio/detail/impl/socket_ops.ipp b/asio/include/asio/detail/impl/socket_ops.ipp
index 6b447ffa82..7feb7ca02d 100644
--- a/asio/include/asio/detail/impl/socket_ops.ipp
+++ b/asio/include/asio/detail/impl/socket_ops.ipp
@@ -339,7 +339,25 @@ int close(socket_type s, state_type& state,
         ::fcntl(s, F_SETFL, flags & ~O_NONBLOCK);
 # else // defined(__SYMBIAN32__) || defined(__EMSCRIPTEN__)
       ioctl_arg_type arg = 0;
+#  if defined(ENOTTY) || defined(ENOTCAPABLE)
+      result = ::ioctl(s, FIONBIO, &arg);
+      get_last_error(ec, result < 0);
+      if (false
+#   if defined(ENOTTY)
+          || ec.value() == ENOTTY
+#   endif // defined(ENOTTY)
+#   if defined(ENOTCAPABLE)
+          || ec.value() == ENOTCAPABLE
+#   endif // defined(ENOTCAPABLE)
+        )
+      {
+        int flags = ::fcntl(s, F_GETFL, 0);
+        if (flags >= 0)
+          ::fcntl(s, F_SETFL, flags & ~O_NONBLOCK);
+      }
+#  else // defined(ENOTTY) || defined(ENOTCAPABLE)
       ::ioctl(s, FIONBIO, &arg);
+#  endif // defined(ENOTTY) || defined(ENOTCAPABLE)
 # endif // defined(__SYMBIAN32__) || defined(__EMSCRIPTEN__)
 #endif // defined(ASIO_WINDOWS) || defined(__CYGWIN__)
       state &= ~non_blocking;
@@ -378,11 +396,31 @@ bool set_user_non_blocking(socket_type s,
     result = ::fcntl(s, F_SETFL, flag);
     get_last_error(ec, result < 0);
   }
-#else
+#else // defined(__SYMBIAN32__) || defined(__EMSCRIPTEN__)
   ioctl_arg_type arg = (value ? 1 : 0);
   int result = ::ioctl(s, FIONBIO, &arg);
   get_last_error(ec, result < 0);
-#endif
+# if defined(ENOTTY) || defined(ENOTCAPABLE)
+  if (false
+#  if defined(ENOTTY)
+      || ec.value() == ENOTTY
+#  endif // defined(ENOTTY)
+#  if defined(ENOTCAPABLE)
+      || ec.value() == ENOTCAPABLE
+#  endif // defined(ENOTCAPABLE)
+    )
+  {
+    result = ::fcntl(s, F_GETFL, 0);
+    get_last_error(ec, result < 0);
+    if (result >= 0)
+    {
+      int flag = (value ? (result | O_NONBLOCK) : (result & ~O_NONBLOCK));
+      result = ::fcntl(s, F_SETFL, flag);
+      get_last_error(ec, result < 0);
+    }
+  }
+# endif // defined(ENOTTY) || defined(ENOTCAPABLE)
+#endif // defined(__SYMBIAN32__) || defined(__EMSCRIPTEN__)
 
   if (result >= 0)
   {
@@ -432,11 +470,31 @@ bool set_internal_non_blocking(socket_type s,
     result = ::fcntl(s, F_SETFL, flag);
     get_last_error(ec, result < 0);
   }
-#else
+#else // defined(__SYMBIAN32__) || defined(__EMSCRIPTEN__)
   ioctl_arg_type arg = (value ? 1 : 0);
   int result = ::ioctl(s, FIONBIO, &arg);
   get_last_error(ec, result < 0);
-#endif
+# if defined(ENOTTY) || defined(ENOTCAPABLE)
+  if (false
+#  if defined(ENOTTY)
+      || ec.value() == ENOTTY
+#  endif // defined(ENOTTY)
+#  if defined(ENOTCAPABLE)
+      || ec.value() == ENOTCAPABLE
+#  endif // defined(ENOTCAPABLE)
+    )
+  {
+    result = ::fcntl(s, F_GETFL, 0);
+    get_last_error(ec, result < 0);
+    if (result >= 0)
+    {
+      int flag = (value ? (result | O_NONBLOCK) : (result & ~O_NONBLOCK));
+      result = ::fcntl(s, F_SETFL, flag);
+      get_last_error(ec, result < 0);
+    }
+  }
+# endif // defined(ENOTTY) || defined(ENOTCAPABLE)
+#endif // defined(__SYMBIAN32__) || defined(__EMSCRIPTEN__)
 
   if (result >= 0)
   {