diff --git a/dlls/ntdll/unix/signal_arm.c b/dlls/ntdll/unix/signal_arm.c
index 0f6f81d2ee1..9501f8fbaef 100644
--- a/dlls/ntdll/unix/signal_arm.c
+++ b/dlls/ntdll/unix/signal_arm.c
@@ -1035,10 +1035,11 @@ NTSTATUS call_user_apc_dispatcher( CONTEXT *context, ULONG_PTR arg1, ULONG_PTR a
         NtGetContextThread( GetCurrentThread(), &stack->context );
         stack->context.R0 = status;
     }
-    stack->func    = func;
-    stack->args[0] = arg1;
-    stack->args[1] = arg2;
-    stack->args[2] = arg3;
+    stack->func      = func;
+    stack->args[0]   = arg1;
+    stack->args[1]   = arg2;
+    stack->args[2]   = arg3;
+    stack->alertable = TRUE;
 
     frame->sp = (DWORD)stack;
     frame->pc = (DWORD)pKiUserApcDispatcher;
diff --git a/dlls/ntdll/unix/signal_arm64.c b/dlls/ntdll/unix/signal_arm64.c
index bc5b8f0b88a..6d6f7bcc8b9 100644
--- a/dlls/ntdll/unix/signal_arm64.c
+++ b/dlls/ntdll/unix/signal_arm64.c
@@ -754,10 +754,11 @@ NTSTATUS call_user_apc_dispatcher( CONTEXT *context, ULONG_PTR arg1, ULONG_PTR a
         NtGetContextThread( GetCurrentThread(), &stack->context );
         stack->context.X0 = status;
     }
-    stack->func    = func;
-    stack->args[0] = arg1;
-    stack->args[1] = arg2;
-    stack->args[2] = arg3;
+    stack->func      = func;
+    stack->args[0]   = arg1;
+    stack->args[1]   = arg2;
+    stack->args[2]   = arg3;
+    stack->alertable = TRUE;
 
     frame->sp = (ULONG64)stack;
     frame->pc = (ULONG64)pKiUserApcDispatcher;