diff --git a/integration_tests/lpython_decorator_02.py b/integration_tests/lpython_decorator_02.py
index 423243f7cd..31cb14c6ba 100644
--- a/integration_tests/lpython_decorator_02.py
+++ b/integration_tests/lpython_decorator_02.py
@@ -1,5 +1,5 @@
 from numpy import array
-from lpython import i32, i64, f64, lpython, TypeVar
+from lpython import i32, i64, f64, lpython, TypeVar, Const
 
 n = TypeVar("n")
 
@@ -17,6 +17,10 @@ def multiply_02(n: i32, x: i64[:], y: i64[:]) -> i64[n]:
         z[i] = x[i] * y[i]
     return z
 
+@lpython
+def const_arg_sum(x: Const[i32]) -> i32:
+    return 10 + x
+
 
 def test_01():
     size = 5
@@ -30,5 +34,6 @@ def test_01():
     z = multiply_02(size, x, y)
     for i in range(size):
         assert z[i] == x[i] * y[i]
+    assert const_arg_sum(size) == size + 10
 
 test_01()
diff --git a/src/libasr/codegen/asr_to_c_cpp.h b/src/libasr/codegen/asr_to_c_cpp.h
index ef718db8f6..48f0d8df94 100644
--- a/src/libasr/codegen/asr_to_c_cpp.h
+++ b/src/libasr/codegen/asr_to_c_cpp.h
@@ -694,6 +694,8 @@ R"(#include <stdio.h>
                 }
             } case ASR::ttypeType::Logical : {
                 return "p";
+            } case ASR::ttypeType::Const : {
+                return get_type_format(ASR::down_cast<ASR::Const_t>(type)->m_type);
             } case ASR::ttypeType::Array : {
                 return "O";
             } default: {