diff --git a/decompiler/pipeline/preprocessing/register_pair_handling.py b/decompiler/pipeline/preprocessing/register_pair_handling.py
index 9b4f8ee15..da5ad1b59 100644
--- a/decompiler/pipeline/preprocessing/register_pair_handling.py
+++ b/decompiler/pipeline/preprocessing/register_pair_handling.py
@@ -200,7 +200,7 @@ def _add_definition_for_replacement(
                         OperationType.left_shift,
                         [
                             register_pair.high,
-                            Constant(register_pair.low.type.size, vartype=Integer.int32_t())
+                            Constant(register_pair.low.type.size, vartype=Integer.uint8_t())
                         ]
                     )
                 ],