diff --git a/runtime/src/vampir/stdlib.pir b/runtime/src/vampir/stdlib.pir
index 246ae2de16..31f2237d51 100644
--- a/runtime/src/vampir/stdlib.pir
+++ b/runtime/src/vampir/stdlib.pir
@@ -63,6 +63,19 @@ def mul (x, e1) (y, e2) = {
     (x * y, e1 * e2 * range_check (x * y))
 };
 
+def fadd (x, e1) (y, e2) = {
+    (x + y, e1 * e2)
+};
+def fsub (x, e1) (y, e2) = {
+    (x - y, e1 * e2)
+};
+def fmul (x, e1) (y, e2) = {
+    (x * y, e1 * e2)
+};
+def fdiv (x, e1) (y, e2) = {
+    (x / y, e1 * e2)
+};
+
 def equal (x, e1) (y, e2) = (isZero (x - y), e1 * e2);
 
 def if (b, e) (x, e1) (y, e2) = (b * x + (1 - b) * y, e * (b * e1 + (1 - b) * e2));
diff --git a/runtime/src/vampir/stdlib_unsafe.pir b/runtime/src/vampir/stdlib_unsafe.pir
index f27cf00794..0855d2a73d 100644
--- a/runtime/src/vampir/stdlib_unsafe.pir
+++ b/runtime/src/vampir/stdlib_unsafe.pir
@@ -41,6 +41,11 @@ def add x y = x + y;
 def sub x y = x - y;
 def mul x y = x * y;
 
+def fadd x y = x + y;
+def fsub x y = x - y;
+def fmul x y = x * y;
+def fdiv x y = x / y;
+
 def equal x y = isZero (x - y);
 
 def if b x y = b * x + (1 - b) * y;
diff --git a/src/Juvix/Compiler/Backend/VampIR/Language.hs b/src/Juvix/Compiler/Backend/VampIR/Language.hs
index 96b5a14f13..11c08d5198 100644
--- a/src/Juvix/Compiler/Backend/VampIR/Language.hs
+++ b/src/Juvix/Compiler/Backend/VampIR/Language.hs
@@ -16,6 +16,10 @@ data OpCode
   | OpMul
   | OpDiv
   | OpMod
+  | OpFieldAdd
+  | OpFieldSub
+  | OpFieldMul
+  | OpFieldDiv
   | OpEq
   | OpLt
   | OpLe
diff --git a/src/Juvix/Compiler/Backend/VampIR/Pretty/Base.hs b/src/Juvix/Compiler/Backend/VampIR/Pretty/Base.hs
index ca33753804..4c05c02867 100644
--- a/src/Juvix/Compiler/Backend/VampIR/Pretty/Base.hs
+++ b/src/Juvix/Compiler/Backend/VampIR/Pretty/Base.hs
@@ -29,6 +29,10 @@ instance PrettyCode OpCode where
     OpMul -> return kwMul
     OpDiv -> return kwDiv
     OpMod -> return kwMod
+    OpFieldAdd -> return kwFieldAdd
+    OpFieldSub -> return kwFieldSub
+    OpFieldMul -> return kwFieldMul
+    OpFieldDiv -> return kwFieldDiv
     OpEq -> return kwEqual
     OpLt -> return kwLessThan
     OpLe -> return kwLessOrEqual
diff --git a/src/Juvix/Compiler/Backend/VampIR/Pretty/Keywords.hs b/src/Juvix/Compiler/Backend/VampIR/Pretty/Keywords.hs
index a54fdb5967..c40416fa74 100644
--- a/src/Juvix/Compiler/Backend/VampIR/Pretty/Keywords.hs
+++ b/src/Juvix/Compiler/Backend/VampIR/Pretty/Keywords.hs
@@ -31,6 +31,18 @@ kwDiv = keyword Str.vampirDiv
 kwMod :: Doc Ann
 kwMod = keyword Str.vampirMod
 
+kwFieldAdd :: Doc Ann
+kwFieldAdd = keyword Str.fadd
+
+kwFieldSub :: Doc Ann
+kwFieldSub = keyword Str.fsub
+
+kwFieldMul :: Doc Ann
+kwFieldMul = keyword Str.fmul
+
+kwFieldDiv :: Doc Ann
+kwFieldDiv = keyword Str.fdiv
+
 kwEqual :: Doc Ann
 kwEqual = keyword Str.vampirEqual
 
diff --git a/src/Juvix/Compiler/Backend/VampIR/Translation/FromCore.hs b/src/Juvix/Compiler/Backend/VampIR/Translation/FromCore.hs
index 77bb107a37..2e7e86071f 100644
--- a/src/Juvix/Compiler/Backend/VampIR/Translation/FromCore.hs
+++ b/src/Juvix/Compiler/Backend/VampIR/Translation/FromCore.hs
@@ -92,11 +92,18 @@ fromCoreNode ii node =
             OpIntMod -> OpMod
             OpIntLt -> OpLt
             OpIntLe -> OpLe
+            Core.OpFieldAdd -> VampIR.OpFieldAdd
+            Core.OpFieldSub -> VampIR.OpFieldSub
+            Core.OpFieldMul -> VampIR.OpFieldMul
+            Core.OpFieldDiv -> VampIR.OpFieldDiv
             Core.OpEq -> VampIR.OpEq
             _ -> impossible
-      _ -> case _builtinAppOp of
+      [x] -> case _builtinAppOp of
         OpFail -> ExpressionFail
+        OpFieldToInt -> convertExpr x
+        OpFieldFromInt -> convertExpr x
         _ -> impossible
+      _ -> impossible
 
     goConstructor :: Constr -> Expression
     goConstructor Constr {..} = case _constrTag of