diff --git a/riscemu/instructions/instruction_set.py b/riscemu/instructions/instruction_set.py
index ef91d18..191686c 100644
--- a/riscemu/instructions/instruction_set.py
+++ b/riscemu/instructions/instruction_set.py
@@ -77,8 +77,8 @@ class InstructionSet(ABC):
         ASSERT_LEN(ins.args, 3)
         if signed:
             return ins.get_reg(0), \
-                   self.get_reg_content(ins, 1), \
-                   self.get_reg_content(ins, 2)
+                   Int32(self.get_reg_content(ins, 1)), \
+                   Int32(self.get_reg_content(ins, 2))
         else:
             return ins.get_reg(0), \
                    UInt32(self.get_reg_content(ins, 1)), \