diff --git a/AK/OwnPtr.h b/AK/OwnPtr.h
index 30e567aae1..582693d9e4 100644
--- a/AK/OwnPtr.h
+++ b/AK/OwnPtr.h
@@ -10,6 +10,8 @@
 #include <AK/RefCounted.h>
 #ifdef KERNEL
 #    include <Kernel/API/KResult.h>
+#else
+#    include <AK/Error.h>
 #endif
 
 #define OWNPTR_SCRUB_BYTE 0xf0
@@ -216,6 +218,15 @@ inline Kernel::KResultOr<NonnullOwnPtr<T>> adopt_nonnull_own_or_enomem(T* object
         return ENOMEM;
     return result.release_nonnull();
 }
+#else
+template<typename T>
+inline ErrorOr<NonnullOwnPtr<T>> adopt_nonnull_own_or_enomem(T* object)
+{
+    auto result = adopt_own_if_nonnull(object);
+    if (!result)
+        return ENOMEM;
+    return result.release_nonnull();
+}
 #endif
 
 template<typename T, class... Args>
@@ -242,10 +253,7 @@ struct Traits<OwnPtr<T>> : public GenericTraits<OwnPtr<T>> {
 
 }
 
+using AK::adopt_nonnull_own_or_enomem;
 using AK::adopt_own_if_nonnull;
 using AK::OwnPtr;
 using AK::try_make;
-
-#ifdef KERNEL
-using AK::adopt_nonnull_own_or_enomem;
-#endif