diff --git a/src/bootstrap/src/utils/ra_project.rs b/src/bootstrap/src/utils/ra_project.rs
index 53342ba72017b..2f985036606d7 100644
--- a/src/bootstrap/src/utils/ra_project.rs
+++ b/src/bootstrap/src/utils/ra_project.rs
@@ -37,6 +37,9 @@ struct Crate {
     proc_macro_dylib_path: Option<String>,
     is_workspace_member: bool,
     root_module: String,
+    // This is only for proc-macro crates, we can skip serializing it.
+    // #[serde(skip)]
+    manifest_path: String,
 }
 
 #[derive(Debug, Default, Serialize, PartialEq, PartialOrd, Ord, Eq)]
@@ -109,14 +112,13 @@ impl RustAnalyzerProject {
 
         // Find and fill dependencies of crates.
         for package in packages {
-            if package.dependencies.is_empty() {
-                continue;
-            }
+            if let Some(index) =
+                ra_project.crates.iter().position(|c| c.display_name == package.name)
+            {
+                // Needed for proc-macro crates.
+                ra_project.crates[index].manifest_path = package.manifest_path;
 
-            for dependency in package.dependencies {
-                if let Some(index) =
-                    ra_project.crates.iter().position(|c| c.display_name == package.name)
-                {
+                for dependency in package.dependencies {
                     if let Some(dependency_index) =
                         ra_project.crates.iter().position(|c| c.display_name == dependency.name)
                     {