diff --git a/crates/rspack_plugin_devtool/src/source_map_dev_tool_plugin.rs b/crates/rspack_plugin_devtool/src/source_map_dev_tool_plugin.rs
index 2d6bfb787c1b..68d4210f7e16 100644
--- a/crates/rspack_plugin_devtool/src/source_map_dev_tool_plugin.rs
+++ b/crates/rspack_plugin_devtool/src/source_map_dev_tool_plugin.rs
@@ -407,8 +407,8 @@ impl SourceMapDevToolPlugin {
             let chunk = file_to_chunk.get(&source_filename);
             let filename = match &self.file_context {
               Some(file_context) => Cow::Owned(
-                Path::new(file_context)
-                  .relative(Path::new(&source_filename))
+                Path::new(&source_filename)
+                  .relative(Path::new(file_context))
                   .to_string_lossy()
                   .to_string(),
               ),
@@ -454,10 +454,8 @@ impl SourceMapDevToolPlugin {
                 source_map_path.extend(Path::new(&source_map_filename).components());
 
                 #[allow(clippy::unwrap_used)]
-                file_path
-                  .parent()
-                  .unwrap()
-                  .relative(&source_map_path)
+                source_map_path
+                  .relative(file_path.parent().unwrap())
                   .to_string_lossy()
                   .to_string()
               };