diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7a72c55f3d..9bd1d04c4c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,8 @@
 
 #### :bug: Bug fix
 
+- Include `-runtime-path` as bsc argument when generating `.mlmap` file. https://github.com/rescript-lang/rescript/pull/7888
+
 #### :memo: Documentation
 
 #### :nail_care: Polish
diff --git a/cli/common/runtime.js b/cli/common/runtime.js
index 2b9af59ec0..9967e1cef5 100644
--- a/cli/common/runtime.js
+++ b/cli/common/runtime.js
@@ -42,10 +42,7 @@ async function resolvePackageInDeno(pkgName) {
 }
 
 async function resolvePackageRoot(pkgName) {
-  const specifier =
-    typeof globalThis.Deno !== "undefined"
-      ? `npm:${pkgName}/package.json`
-      : `${pkgName}/package.json`;
+  const specifier = `${pkgName}/package.json`;
 
   if (typeof import.meta.resolve === "function") {
     const url = import.meta.resolve(specifier);
diff --git a/compiler/bsb/bsb_ninja_rule.ml b/compiler/bsb/bsb_ninja_rule.ml
index 2f90bb42e9..b5a41f407b 100644
--- a/compiler/bsb/bsb_ninja_rule.ml
+++ b/compiler/bsb/bsb_ninja_rule.ml
@@ -206,7 +206,9 @@ let make_custom_rules ~(gentype_config : Bsb_config_types.gentype_config)
   let mi, mi_dev = aux ~read_cmi:`is_cmi ~postbuild:None ~name:"mi" in
   let build_package =
     define
-      ~command:(bsc ^ " -w -49 -color always -no-alias-deps  $i")
+      ~command:
+        (bsc ^ " -w -49 -color always -no-alias-deps -runtime-path "
+       ^ !Runtime_package.path ^ "  $i")
       ~restat:() "build_package"
   in
   {
diff --git a/rewatch/src/build/compile.rs b/rewatch/src/build/compile.rs
index 578ce4c112..67074c9ddd 100644
--- a/rewatch/src/build/compile.rs
+++ b/rewatch/src/build/compile.rs
@@ -336,7 +336,10 @@ pub fn compile(
     Ok((compile_errors, compile_warnings, num_compiled_modules))
 }
 
-fn get_runtime_path_args(package_config: &Config, project_context: &ProjectContext) -> Result<Vec<String>> {
+pub fn get_runtime_path_args(
+    package_config: &Config,
+    project_context: &ProjectContext,
+) -> Result<Vec<String>> {
     match std::env::var("RESCRIPT_RUNTIME") {
         Ok(runtime_path) => Ok(vec!["-runtime-path".to_string(), runtime_path]),
         Err(_) => match helpers::try_package_path(package_config, project_context, "@rescript/runtime") {
diff --git a/rewatch/src/build/namespaces.rs b/rewatch/src/build/namespaces.rs
index 4bd63501b5..9042e8a2ec 100644
--- a/rewatch/src/build/namespaces.rs
+++ b/rewatch/src/build/namespaces.rs
@@ -1,12 +1,14 @@
+use crate::build::compile::get_runtime_path_args;
 use crate::build::packages;
 use crate::helpers::StrippedVerbatimPath;
+use crate::project_context::ProjectContext;
 use ahash::AHashSet;
+use anyhow::{Result, anyhow};
 use std::fs::File;
 use std::io::Write;
 use std::path::Path;
 use std::path::PathBuf;
 use std::process::Command;
-
 // Namespaces work like the following: The build system will generate a file
 // called `MyModule.mlmap` which contains all modules that are in the namespace
 //
@@ -51,12 +53,28 @@ pub fn gen_mlmap(
     path
 }
 
-pub fn compile_mlmap(package: &packages::Package, namespace: &str, bsc_path: &Path) {
+pub fn compile_mlmap(
+    project_context: &ProjectContext,
+    package: &packages::Package,
+    namespace: &str,
+    bsc_path: &Path,
+) -> Result<()> {
     let build_path_abs = package.get_build_path();
     let mlmap_name = format!("{namespace}.mlmap");
-    let args = vec!["-w", "-49", "-color", "always", "-no-alias-deps", &mlmap_name];
+    let mut args: Vec<String> = vec![];
+    // include `-runtime-path` arg
+    args.extend(get_runtime_path_args(&package.config, project_context)?);
+    // remaining flags
+    args.extend([
+        "-w".to_string(),
+        "-49".to_string(),
+        "-color".to_string(),
+        "always".to_string(),
+        "-no-alias-deps".to_string(),
+    ]);
+    args.push(mlmap_name.clone());
 
-    let _ = Command::new(bsc_path)
+    let output = Command::new(bsc_path)
         .current_dir(
             build_path_abs
                 .canonicalize()
@@ -64,7 +82,18 @@ pub fn compile_mlmap(package: &packages::Package, namespace: &str, bsc_path: &Pa
                 .ok()
                 .unwrap(),
         )
-        .args(args)
-        .output()
-        .expect("err");
+        .args(&args)
+        .output()?;
+
+    if !output.status.success() {
+        let stderr = String::from_utf8_lossy(&output.stderr).to_string();
+        return Err(anyhow!(
+            "Failed to compile namespace mlmap {} in {}: {}",
+            namespace,
+            build_path_abs.to_string_lossy(),
+            stderr
+        ));
+    }
+
+    Ok(())
 }
diff --git a/rewatch/src/build/parse.rs b/rewatch/src/build/parse.rs
index 6e0380f671..f1a8583ffe 100644
--- a/rewatch/src/build/parse.rs
+++ b/rewatch/src/build/parse.rs
@@ -16,7 +16,7 @@ use std::process::Command;
 pub fn generate_asts(
     build_state: &mut BuildState,
     inc: impl Fn() + std::marker::Sync,
-) -> Result<String, String> {
+) -> anyhow::Result<String> {
     let mut has_failure = false;
     let mut stderr = "".to_string();
 
@@ -192,7 +192,15 @@ pub fn generate_asts(
                     // specific to compiling mlmaps
                     let compile_path = package.get_mlmap_compile_path();
                     let mlmap_hash = helpers::compute_file_hash(Path::new(&compile_path));
-                    namespaces::compile_mlmap(package, module_name, &build_state.bsc_path);
+                    if let Err(err) = namespaces::compile_mlmap(
+                        &build_state.project_context,
+                        package,
+                        module_name,
+                        &build_state.bsc_path,
+                    ) {
+                        has_failure = true;
+                        stderr.push_str(&format!("{}\n", err));
+                    }
                     let mlmap_hash_after = helpers::compute_file_hash(Path::new(&compile_path));
 
                     let suffix = package
@@ -232,7 +240,11 @@ pub fn generate_asts(
         }
     });
 
-    if has_failure { Err(stderr) } else { Ok(stderr) }
+    if has_failure {
+        Err(anyhow!(stderr))
+    } else {
+        Ok(stderr)
+    }
 }
 
 pub fn parser_args(