diff --git a/src/book/mod.rs b/src/book/mod.rs
index 5bd2b194..9a413759 100644
--- a/src/book/mod.rs
+++ b/src/book/mod.rs
@@ -241,7 +241,7 @@ impl MDBook {
     }
 
     /// Register a [`Preprocessor`](../preprocess/trait.Preprocessor.html) to be used when rendering the book.
-    pub fn with_preprecessor<P: Preprocessor + 'static>(&mut self, preprocessor: P) -> &mut Self {
+    pub fn with_preprocessor<P: Preprocessor + 'static>(&mut self, preprocessor: P) -> &mut Self {
         self.preprocessors.push(Box::new(preprocessor));
         self
     }
diff --git a/tests/build_process.rs b/tests/build_process.rs
index 85750ab3..a1e49caa 100644
--- a/tests/build_process.rs
+++ b/tests/build_process.rs
@@ -52,7 +52,7 @@ fn mdbook_runs_preprocessors() {
     let cfg = Config::default();
 
     let mut book = MDBook::load_with_config(temp.path(), cfg).unwrap();
-    book.with_preprecessor(Spy(Arc::clone(&spy)));
+    book.with_preprocessor(Spy(Arc::clone(&spy)));
     book.build().unwrap();
 
     let inner = spy.lock().unwrap();
diff --git a/tests/custom_preprocessors.rs b/tests/custom_preprocessors.rs
index dd120eab..6e71fbbd 100644
--- a/tests/custom_preprocessors.rs
+++ b/tests/custom_preprocessors.rs
@@ -36,7 +36,7 @@ fn ask_the_preprocessor_to_blow_up() {
     let dummy_book = DummyBook::new();
     let temp = dummy_book.build().unwrap();
     let mut md = MDBook::load(temp.path()).unwrap();
-    md.with_preprecessor(example());
+    md.with_preprocessor(example());
 
     md.config
         .set("preprocessor.nop-preprocessor.blow-up", true)
@@ -52,7 +52,7 @@ fn process_the_dummy_book() {
     let dummy_book = DummyBook::new();
     let temp = dummy_book.build().unwrap();
     let mut md = MDBook::load(temp.path()).unwrap();
-    md.with_preprecessor(example());
+    md.with_preprocessor(example());
 
     md.build().unwrap();
 }