diff --git a/src/fcore_constants.f90 b/src/fcore_constants.f90
index 869d80c..4dbb0ec 100644
--- a/src/fcore_constants.f90
+++ b/src/fcore_constants.f90
@@ -31,4 +31,7 @@ module fcore_constants
     integer(int32), parameter :: FCORE_DATA_TYPE_ERROR = 10009
     !> @brief Occurs if an attempt to write to a null reference is made.
     integer(int32), parameter :: FCORE_NULL_REFERENCE_ERROR = 10010
+    !> @brief Occurs if an attempt to perform an operation on an uninitialized
+    !! object is made.
+    integer(int32), parameter :: FCORE_UNINITIALIZED_OBJECT_ERROR = 10011
 end module