diff --git a/lib/entry/libimagentrycategory/src/category.rs b/lib/entry/libimagentrycategory/src/category.rs
index ea2fbf90..4bc52010 100644
--- a/lib/entry/libimagentrycategory/src/category.rs
+++ b/lib/entry/libimagentrycategory/src/category.rs
@@ -52,7 +52,7 @@ impl Category for Entry {
             .read_string(CATEGORY_REGISTER_NAME_FIELD_PATH)
             .context(format_err!("Failed to read header at '{}'", CATEGORY_REGISTER_NAME_FIELD_PATH))
             .map_err(Error::from)?
-            .ok_or_else(|| Error::from(err_msg("Category name missing")))
+            .ok_or_else(|| err_msg("Category name missing"))
     }
 
     fn get_entries<'a>(&self, store: &'a Store) -> Result<CategoryEntryIterator<'a>> {
diff --git a/lib/entry/libimagentrycategory/src/entry.rs b/lib/entry/libimagentrycategory/src/entry.rs
index 9d0e06ba..8ea7a4d1 100644
--- a/lib/entry/libimagentrycategory/src/entry.rs
+++ b/lib/entry/libimagentrycategory/src/entry.rs
@@ -65,10 +65,10 @@ impl EntryCategory for Entry {
         trace!("Setting category '{}' checked", s);
         let mut category = register
             .get_category_by_name(s)?
-            .ok_or_else(|| Error::from(err_msg("Category does not exist")))?;
+            .ok_or_else(|| err_msg("Category does not exist"))?;
 
-        let _ = self.set_category(s)?;
-        let _ = self.add_link(&mut category)?;
+        self.set_category(s)?;
+        self.add_link(&mut category)?;
 
         Ok(())
     }
@@ -77,7 +77,7 @@ impl EntryCategory for Entry {
         trace!("Getting category from '{}'", self.get_location());
         self.get_header()
             .read_string("category.value")?
-            .ok_or_else(|| Error::from(err_msg("Category name missing")))
+            .ok_or_else(|| err_msg("Category name missing"))
     }
 
     fn has_category(&self) -> Result<bool> {
diff --git a/lib/entry/libimagentrycategory/src/iter.rs b/lib/entry/libimagentrycategory/src/iter.rs
index 7ed342c7..99574f6a 100644
--- a/lib/entry/libimagentrycategory/src/iter.rs
+++ b/lib/entry/libimagentrycategory/src/iter.rs
@@ -103,7 +103,7 @@ impl<'a> Iterator for CategoryEntryIterator<'a> {
                     let getter = |next| -> Result<(String, FileLockEntry<'a>)> {
                         let entry = self.0
                             .get(next)?
-                            .ok_or_else(|| Error::from(err_msg("Store read error")))?;
+                            .ok_or_else(|| err_msg("Store read error"))?;
                         Ok((entry.get_category()?, entry))
                     };
 
diff --git a/lib/entry/libimagentrycategory/src/store.rs b/lib/entry/libimagentrycategory/src/store.rs
index 8ef44545..fa8a6c16 100644
--- a/lib/entry/libimagentrycategory/src/store.rs
+++ b/lib/entry/libimagentrycategory/src/store.rs
@@ -34,7 +34,7 @@ use failure::err_msg;
 use crate::iter::CategoryNameIter;
 use crate::category::IsCategory;
 
-pub const CATEGORY_REGISTER_NAME_FIELD_PATH : &'static str = "category.register.name";
+pub const CATEGORY_REGISTER_NAME_FIELD_PATH : &str = "category.register.name";
 
 /// Extension on the Store to make it a register for categories
 ///
@@ -92,12 +92,12 @@ impl CategoryStore for Store {
 
         {
             let mut category = self.get(sid.clone())?
-                .ok_or_else(|| Error::from(err_msg("Category does not exist")))
+                .ok_or_else(|| err_msg("Category does not exist"))
                 .map_err(Error::from)?;
 
             for entry in category.get_entries(self)? {
                 let mut entry = entry?;
-                let _         = category.remove_link(&mut entry)?;
+                category.remove_link(&mut entry)?;
             }
         }