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/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