diff --git a/parser/src/file_locations.rs b/parser/src/file_locations.rs
index a113d0f..29acb48 100644
--- a/parser/src/file_locations.rs
+++ b/parser/src/file_locations.rs
@@ -77,7 +77,7 @@
             FileLocationStrategy::Custom(_) => panic!("Should never happen in the macro"),
             FileLocationStrategy::UnknownMaybeFromOutdir | FileLocationStrategy::FromOutDir(_) => {
                 let fname = config.get_rs_filename();
-                let fname = format!("/{}/{}/{}", BUILD_DIR_NAME, RS_DIR_NAME, fname);
+                let fname = format!("/{BUILD_DIR_NAME}/{RS_DIR_NAME}/{fname}");
                 // rust-analyzer works better if we ask Rust to do the path
                 // concatenation rather than doing it in proc-macro code.
                 // proc-macro code does not itself have access to the value of
@@ -95,13 +95,13 @@
                     include!( #fname );
                 }
             }
-            FileLocationStrategy::FromAutocxxRsJsonArchive(fname) => {
-                let archive = File::open(fname).unwrap_or_else(|_| panic!("Unable to open {}. This may mean you didn't run the codegen tool (autocxx_gen) before building the Rust code.", fname.to_string_lossy()));
+            FileLocationStrategy::FromAutocxxRsJsonArchive(fnames) => {
+                let archive = std::env::split_paths(fnames).flat_map(File::open).next().unwrap_or_else(|| panic!("Unable to open any of the paths listed in {}. This may mean you didn't run the codegen tool (autocxx_gen) before building the Rust code.", fnames.to_string_lossy()));
                 let multi_bindings: MultiBindings = serde_json::from_reader(archive)
                     .unwrap_or_else(|_| {
-                        panic!("Unable to interpret {} as JSON", fname.to_string_lossy())
+                        panic!("Unable to interpret {} as JSON", fnames.to_string_lossy())
                     });
-                multi_bindings.get(config).unwrap_or_else(|err| panic!("Unable to find a suitable set of bindings within the JSON archive {} ({}). This likely means that the codegen tool hasn't been rerun since some changes in your include_cpp! macro.", fname.to_string_lossy(), err))
+                multi_bindings.get(config).unwrap_or_else(|err| panic!("Unable to find a suitable set of bindings within the JSON archive {} ({}). This likely means that the codegen tool hasn't been rerun since some changes in your include_cpp! macro.", fnames.to_string_lossy(), err))
             }
         }
     }