diff --git a/collects/profile/analyzer.ss b/collects/profile/analyzer.rkt
similarity index 100%
rename from collects/profile/analyzer.ss
rename to collects/profile/analyzer.rkt
diff --git a/collects/profile/main.ss b/collects/profile/main.rkt
similarity index 100%
rename from collects/profile/main.ss
rename to collects/profile/main.rkt
diff --git a/collects/profile/render-graphviz.ss b/collects/profile/render-graphviz.rkt
similarity index 100%
rename from collects/profile/render-graphviz.ss
rename to collects/profile/render-graphviz.rkt
diff --git a/collects/profile/render-text.ss b/collects/profile/render-text.rkt
similarity index 100%
rename from collects/profile/render-text.ss
rename to collects/profile/render-text.rkt
diff --git a/collects/profile/sampler.ss b/collects/profile/sampler.rkt
similarity index 100%
rename from collects/profile/sampler.ss
rename to collects/profile/sampler.rkt
diff --git a/collects/profile/scribblings/info.ss b/collects/profile/scribblings/info.rkt
similarity index 100%
rename from collects/profile/scribblings/info.ss
rename to collects/profile/scribblings/info.rkt
diff --git a/collects/profile/scribblings/toplevel.scrbl b/collects/profile/scribblings/toplevel.scrbl
index 751af09..4beabcc 100644
--- a/collects/profile/scribblings/toplevel.scrbl
+++ b/collects/profile/scribblings/toplevel.scrbl
@@ -9,7 +9,7 @@
 
 @defmodule[profile]
 
-This module provides one procedure and one macroxs that are convenient
+This module provides one procedure and one macro that are convenient
 high-level entry points for timing expressions.  This hides the
 details that are available through other parts of the library, and is
 intended as a convenient tool for profiling code.
diff --git a/collects/profile/structs.ss b/collects/profile/structs.rkt
similarity index 100%
rename from collects/profile/structs.ss
rename to collects/profile/structs.rkt
diff --git a/collects/profile/utils.ss b/collects/profile/utils.rkt
similarity index 100%
rename from collects/profile/utils.ss
rename to collects/profile/utils.rkt
diff --git a/collects/tests/profile/main.ss b/collects/tests/profile/main.rkt
similarity index 100%
rename from collects/tests/profile/main.ss
rename to collects/tests/profile/main.rkt
diff --git a/collects/tests/profile/topsort.ss b/collects/tests/profile/topsort.rkt
similarity index 100%
rename from collects/tests/profile/topsort.ss
rename to collects/tests/profile/topsort.rkt