diff --git a/src/manifest/mod.rs b/src/manifest/mod.rs
index 6a483523..5fb73c7a 100644
--- a/src/manifest/mod.rs
+++ b/src/manifest/mod.rs
@@ -734,6 +734,7 @@ impl CrateData {
                     url: repo_url,
                 }),
             files: data.files,
+            main: data.main.clone(),
             module: data.main,
             homepage: data.homepage,
             types: data.dts_file,
@@ -771,6 +772,7 @@ impl CrateData {
                     url: repo_url,
                 }),
             files: data.files,
+            main: data.main.clone(),
             module: data.main,
             homepage: data.homepage,
             types: data.dts_file,
@@ -808,6 +810,7 @@ impl CrateData {
                     url: repo_url,
                 }),
             files: data.files,
+            main: data.main.clone(),
             browser: data.main,
             homepage: data.homepage,
             types: data.dts_file,
diff --git a/src/manifest/npm/esmodules.rs b/src/manifest/npm/esmodules.rs
index b3b541b7..dc160c7d 100644
--- a/src/manifest/npm/esmodules.rs
+++ b/src/manifest/npm/esmodules.rs
@@ -16,6 +16,7 @@ pub struct ESModulesPackage {
     pub repository: Option<Repository>,
     #[serde(skip_serializing_if = "Vec::is_empty")]
     pub files: Vec<String>,
+    pub main: String,
     pub module: String,
     #[serde(skip_serializing_if = "Option::is_none")]
     pub homepage: Option<String>,
diff --git a/src/manifest/npm/nomodules.rs b/src/manifest/npm/nomodules.rs
index 20567cca..24afba1c 100644
--- a/src/manifest/npm/nomodules.rs
+++ b/src/manifest/npm/nomodules.rs
@@ -16,6 +16,7 @@ pub struct NoModulesPackage {
     pub repository: Option<Repository>,
     #[serde(skip_serializing_if = "Vec::is_empty")]
     pub files: Vec<String>,
+    pub main: String,
     pub browser: String,
     #[serde(skip_serializing_if = "Option::is_none")]
     pub homepage: Option<String>,