diff --git a/Cargo.lock b/Cargo.lock
index 4aaeb4b351..69d526c6f6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1133,6 +1133,12 @@ version = "0.4.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "56899898ce76aaf4a0f24d914c97ea6ed976d42fec6ad33fcbb0a1103e07b2b0"
 
+[[package]]
+name = "dunce"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "453440c271cf5577fd2a40e4942540cb7d0d2f85e27c8d07dd0023c925a67541"
+
 [[package]]
 name = "dynasm"
 version = "1.2.1"
@@ -3228,6 +3234,7 @@ dependencies = [
 name = "roc_builtins"
 version = "0.1.0"
 dependencies = [
+ "dunce",
  "roc_collections",
  "roc_module",
  "roc_region",
diff --git a/compiler/builtins/Cargo.toml b/compiler/builtins/Cargo.toml
index 91879456d7..579cae97ed 100644
--- a/compiler/builtins/Cargo.toml
+++ b/compiler/builtins/Cargo.toml
@@ -11,3 +11,7 @@ roc_region = { path = "../region" }
 roc_module = { path = "../module" }
 roc_types = { path = "../types" }
 roc_target = { path = "../roc_target" }
+
+[build-dependencies]
+# dunce can be removed once ziglang/zig#5109 is fixed
+dunce = "1.0.2"
diff --git a/compiler/builtins/build.rs b/compiler/builtins/build.rs
index 5e474a55dd..b117f888f7 100644
--- a/compiler/builtins/build.rs
+++ b/compiler/builtins/build.rs
@@ -27,7 +27,8 @@ fn main() {
     }
 
     // "." is relative to where "build.rs" is
-    let build_script_dir_path = fs::canonicalize(Path::new(".")).unwrap();
+    // dunce can be removed once ziglang/zig#5109 is fixed
+    let build_script_dir_path = dunce::canonicalize(Path::new(".")).unwrap();
     let bitcode_path = build_script_dir_path.join("bitcode");
 
     // LLVM .bc FILES