diff --git a/nix/libstore/globals.hh b/nix/libstore/globals.hh
index c2824789ede..d68993f280f 100644
--- a/nix/libstore/globals.hh
+++ b/nix/libstore/globals.hh
@@ -103,7 +103,7 @@ struct Settings {
     /* The canonical system name, as returned by config.guess. */
     string thisSystem;
 
-    /* The maximum time in seconds that a builer can go without
+    /* The maximum time in seconds that a builder can go without
        producing any output on stdout/stderr before it is killed.  0
        means infinity. */
     time_t maxSilentTime;
diff --git a/nix/libstore/store-api.hh b/nix/libstore/store-api.hh
index affa98b179d..b57f1e10842 100644
--- a/nix/libstore/store-api.hh
+++ b/nix/libstore/store-api.hh
@@ -357,7 +357,7 @@ Path addPermRoot(StoreAPI & store, const Path & storePath,
 
 
 /* Sort a set of paths topologically under the references relation.
-   If p refers to q, then p preceeds q in this list. */
+   If p refers to q, then p precedes q in this list. */
 Paths topoSortPaths(StoreAPI & store, const PathSet & paths);
 
 
diff --git a/nix/libutil/util.hh b/nix/libutil/util.hh
index 42cb60ea0d4..3bf2f0be754 100644
--- a/nix/libutil/util.hh
+++ b/nix/libutil/util.hh
@@ -170,7 +170,7 @@ void writeToStderr(const string & s);
 inline void (*_writeToStderr) (const unsigned char * buf, size_t count) = 0;
 
 
-/* Wrappers arount read()/write() that read/write exactly the
+/* Wrappers around read()/write() that read/write exactly the
    requested number of bytes. */
 void readFull(int fd, unsigned char * buf, size_t count);
 void writeFull(int fd, const unsigned char * buf, size_t count);