diff --git a/compiler/builtins/src/std.rs b/compiler/builtins/src/std.rs
index f66975d2ac..186b008cf7 100644
--- a/compiler/builtins/src/std.rs
+++ b/compiler/builtins/src/std.rs
@@ -294,6 +294,12 @@ pub fn types() -> MutMap<Symbol, (SolvedType, Region)> {
         ),
     );
 
+    // div : Int, Int -> Int
+    add_type(
+        Symbol::INT_DIV_UNSAFE,
+        SolvedType::Func(vec![int_type(), int_type()], Box::new(int_type())),
+    );
+
     // mod : Int, Int -> Result Int [ DivByZero ]*
     add_type(
         Symbol::INT_MOD,
diff --git a/compiler/builtins/src/unique.rs b/compiler/builtins/src/unique.rs
index 0a0671b0cf..ca6ac0fce9 100644
--- a/compiler/builtins/src/unique.rs
+++ b/compiler/builtins/src/unique.rs
@@ -348,9 +348,23 @@ pub fn types() -> MutMap<Symbol, (SolvedType, Region)> {
     // lowest : Int
     add_type(Symbol::INT_LOWEST, int_type(UVAR1));
 
-    // div or (//) : Int, Int -> Int
+    // div or (//) : Int, Int -> Result Int [ DivByZero ]*
+    let div_by_zero = SolvedType::TagUnion(
+        vec![(TagName::Global("DivByZero".into()), vec![])],
+        Box::new(SolvedType::Wildcard),
+    );
+
     add_type(
         Symbol::INT_DIV,
+        unique_function(
+            vec![int_type(UVAR1), int_type(UVAR2)],
+            result_type(UVAR3, int_type(UVAR4), lift(UVAR5, div_by_zero)),
+        ),
+    );
+
+    // div or (//) : Int, Int -> Int
+    add_type(
+        Symbol::INT_DIV_UNSAFE,
         unique_function(vec![int_type(UVAR1), int_type(UVAR2)], int_type(UVAR3)),
     );
 
diff --git a/compiler/gen/src/llvm/build.rs b/compiler/gen/src/llvm/build.rs
index 8a9eafe24c..005fde49f0 100644
--- a/compiler/gen/src/llvm/build.rs
+++ b/compiler/gen/src/llvm/build.rs
@@ -1226,6 +1226,17 @@ fn call_with_args<'a, 'ctx, 'env>(
         Symbol::FLOAT_ROUND => call_intrinsic(LLVM_LROUND_I64_F64, env, args),
         Symbol::LIST_SET => list_set(parent, args, env, InPlace::Clone),
         Symbol::LIST_SET_IN_PLACE => list_set(parent, args, env, InPlace::InPlace),
+        Symbol::INT_DIV_UNSAFE => {
+            debug_assert!(args.len() == 2);
+
+            let int_val = env.builder.build_int_signed_div(
+                args[0].0.into_int_value(),
+                args[1].0.into_int_value(),
+                "div_i64",
+            );
+
+            BasicValueEnum::IntValue(int_val)
+        }
         _ => {
             let fn_val = env
                 .module
diff --git a/compiler/gen/tests/gen_builtins.rs b/compiler/gen/tests/gen_builtins.rs
index 13611cde02..d6a78876a8 100644
--- a/compiler/gen/tests/gen_builtins.rs
+++ b/compiler/gen/tests/gen_builtins.rs
@@ -159,6 +159,19 @@ mod gen_builtins {
         );
     }
 
+    #[test]
+    fn gen_div_i64() {
+        assert_evals_to!(
+            indoc!(
+                r#"
+                    Int.divUnsafe 1000 100
+                "#
+            ),
+            10,
+            i64
+        );
+    }
+
     #[test]
     fn gen_order_of_arithmetic_ops() {
         assert_evals_to!(
diff --git a/compiler/module/src/symbol.rs b/compiler/module/src/symbol.rs
index 34abb0569e..5cdf2c7bfe 100644
--- a/compiler/module/src/symbol.rs
+++ b/compiler/module/src/symbol.rs
@@ -599,6 +599,7 @@ define_builtins! {
         9 INT_EQ_I64: "#eqi64" // Equality on 64-bit integers, the standard in Roc
         10 INT_EQ_I1: "#eqi1" // Equality on boolean (theoretically i1) values
         11 INT_EQ_I8: "#eqi8" // Equality on byte (theoretically i8) values
+        12 INT_DIV_UNSAFE: "divUnsafe" // TODO remove once we can code gen Result
     }
     3 FLOAT: "Float" => {
         0 FLOAT_FLOAT: "Float" imported // the Float.Float type alias
diff --git a/compiler/solve/tests/test_uniq_solve.rs b/compiler/solve/tests/test_uniq_solve.rs
index 5eff143efe..717c518b4d 100644
--- a/compiler/solve/tests/test_uniq_solve.rs
+++ b/compiler/solve/tests/test_uniq_solve.rs
@@ -1944,7 +1944,7 @@ mod test_uniq_solve {
                 Int.highest // Int.highest
                "#
             ),
-            "Attr * Int",
+            "Attr * (Result (Attr * Int) (Attr * [ DivByZero ]*))",
         );
     }
 
@@ -1956,7 +1956,7 @@ mod test_uniq_solve {
                 3 // 4
                "#
             ),
-            "Attr * Int",
+            "Attr * (Result (Attr * Int) (Attr * [ DivByZero ]*))",
         );
     }
 
@@ -1968,7 +1968,7 @@ mod test_uniq_solve {
                 3 // Int.highest
                "#
             ),
-            "Attr * Int",
+            "Attr * (Result (Attr * Int) (Attr * [ DivByZero ]*))",
         );
     }
 
@@ -2097,8 +2097,8 @@ mod test_uniq_solve {
                     reverse
                 "#
             ),
-            // "Attr * (Attr * (List (Attr (a | b) c)) -> Attr (* | a | b) (List (Attr b c)))",
-            "Attr * (Attr * (List (Attr (a | b) c)) -> Attr (* | a | b) (List (Attr a c)))",
+            "Attr * (Attr * (List (Attr (a | b) c)) -> Attr (* | a | b) (List (Attr b c)))",
+            // "Attr * (Attr * (List (Attr (a | b) c)) -> Attr (* | a | b) (List (Attr a c)))",
         );
     }