diff --git a/extensions/native/compiler/src/conversion/mod.rs b/extensions/native/compiler/src/conversion/mod.rs
index eb2a25c7a..3adcdb811 100644
--- a/extensions/native/compiler/src/conversion/mod.rs
+++ b/extensions/native/compiler/src/conversion/mod.rs
@@ -503,22 +503,38 @@ fn convert_instruction<F: PrimeField32, EF: ExtensionField<F>>(
                 vec![]
             }
         }
-        AsmInstruction::ImmF(dst, val) => vec![inst(
-            options.opcode_with_offset(NativeLoadStoreOpcode::STOREW),
-            val,
-            F::ZERO,
-            i32_f(dst),
-            AS::Immediate,
-            AS::Native,
-        )],
-        AsmInstruction::CopyF(dst, src) => vec![inst(
-            options.opcode_with_offset(NativeLoadStoreOpcode::LOADW),
-            i32_f(dst),
-            F::ZERO,
-            i32_f(src),
-            AS::Native,
-            AS::Immediate,
-        )],
+        AsmInstruction::ImmF(dst, val) => if options.field_arithmetic_enabled {
+            vec![inst_med(
+                options.opcode_with_offset(FieldArithmeticOpcode::ADD),
+                i32_f(dst),
+                val,
+                F::ZERO,
+                AS::Native,
+                AS::Immediate,
+                AS::Native,
+            )]
+        } else {
+            panic!(
+                "Unsupported instruction {:?}, field arithmetic is disabled",
+                instruction
+            )       
+        },
+        AsmInstruction::CopyF(dst, src) => if options.field_arithmetic_enabled {
+            vec![inst_med(
+                options.opcode_with_offset(FieldArithmeticOpcode::ADD),
+                i32_f(dst),
+                i32_f(src),
+                F::ZERO,
+                AS::Native,
+                AS::Native,
+                AS::Immediate
+            )]
+        } else {
+            panic!(
+                "Unsupported instruction {:?}, field arithmetic is disabled",
+                instruction
+            )
+        },
         AsmInstruction::AddF(..)
         | AsmInstruction::SubF(..)
         | AsmInstruction::MulF(..)
@@ -612,13 +628,14 @@ pub fn convert_program<F: PrimeField32, EF: ExtensionField<F>>(
     options: CompilerOptions,
 ) -> Program<F> {
     // mem[0] <- 0
-    let init_register_0 = inst(
-        options.opcode_with_offset(NativeLoadStoreOpcode::STOREW),
+    let init_register_0 = inst_med(
+        options.opcode_with_offset(FieldArithmeticOpcode::ADD),
+        F::ZERO,
         F::ZERO,
         F::ZERO,
-        i32_f(0),
-        AS::Immediate,
         AS::Native,
+        AS::Immediate,
+        AS::Immediate,
     );
     let init_debug_info = None;