diff --git a/objdiff-cli/src/cmd/diff.rs b/objdiff-cli/src/cmd/diff.rs
index 186936d..59a4761 100644
--- a/objdiff-cli/src/cmd/diff.rs
+++ b/objdiff-cli/src/cmd/diff.rs
@@ -88,9 +88,13 @@ pub fn run(args: Args) -> Result<()> {
                         let mut count = 0usize;
                         for (i, obj) in project_config.objects.iter_mut().enumerate() {
                             resolve_paths(obj);
-                            if load_obj(&obj.target_path)?
-                                .and_then(|o| find_function(&o, &args.symbol))
-                                .is_some()
+
+                            if obj
+                                .target_path
+                                .as_deref()
+                                .map(|o| obj::elf::has_function(o, &args.symbol))
+                                .transpose()?
+                                .unwrap_or_default()
                             {
                                 idx = Some(i);
                                 count += 1;
@@ -175,12 +179,6 @@ pub fn run(args: Args) -> Result<()> {
     Ok(())
 }
 
-fn load_obj(path: &Option<PathBuf>) -> Result<Option<ObjInfo>> {
-    path.as_deref()
-        .map(|p| obj::elf::read(p).with_context(|| format!("Loading {}", p.display())))
-        .transpose()
-}
-
 fn find_function(obj: &ObjInfo, name: &str) -> Option<ObjSymbol> {
     for section in &obj.sections {
         if section.kind != ObjSectionKind::Code {
@@ -533,8 +531,16 @@ impl FunctionDiffUi {
     }
 
     fn reload(&mut self) -> Result<()> {
-        let mut target = load_obj(&self.target_path)?;
-        let mut base = load_obj(&self.base_path)?;
+        let mut target = self
+            .target_path
+            .as_deref()
+            .map(|p| obj::elf::read(p).with_context(|| format!("Loading {}", p.display())))
+            .transpose()?;
+        let mut base = self
+            .base_path
+            .as_deref()
+            .map(|p| obj::elf::read(p).with_context(|| format!("Loading {}", p.display())))
+            .transpose()?;
         let config = diff::DiffObjConfig::default();
         diff::diff_objs(&config, target.as_mut(), base.as_mut())?;
 
diff --git a/objdiff-core/src/obj/elf.rs b/objdiff-core/src/obj/elf.rs
index 57ff70c..06ad30b 100644
--- a/objdiff-core/src/obj/elf.rs
+++ b/objdiff-core/src/obj/elf.rs
@@ -394,6 +394,17 @@ pub fn read(obj_path: &Path) -> Result<ObjInfo> {
     Ok(result)
 }
 
+pub fn has_function(obj_path: &Path, symbol_name: &str) -> Result<bool> {
+    let data = {
+        let file = fs::File::open(obj_path)?;
+        unsafe { memmap2::Mmap::map(&file) }?
+    };
+    Ok(File::parse(&*data)?
+        .symbol_by_name(symbol_name)
+        .filter(|o| o.kind() == SymbolKind::Text)
+        .is_some())
+}
+
 fn split_meta(obj_file: &File<'_>) -> Result<Option<SplitMeta>> {
     Ok(if let Some(section) = obj_file.section_by_name(SPLITMETA_SECTION) {
         if section.size() != 0 {