diff --git a/collects/images/icons/style.rkt b/collects/images/icons/style.rkt
index 302558df58..2133e6fa3d 100644
--- a/collects/images/icons/style.rkt
+++ b/collects/images/icons/style.rkt
@@ -1,10 +1,10 @@
-#lang racket
+#lang racket/base
 
-(require racket/draw unstable/parameter-group
+(require racket/class racket/draw unstable/parameter-group
          racket/contract unstable/latent-contract unstable/latent-contract/defthing
          "../private/flomap.rkt"
          "../private/deep-flomap.rkt"
-         (for-syntax syntax/parse))
+         (for-syntax racket/base syntax/parse))
 
 (provide light-metal-icon-color
          metal-icon-color
diff --git a/collects/plot/common/math.rkt b/collects/plot/common/math.rkt
index fe86d4e275..b1ccb7eef9 100644
--- a/collects/plot/common/math.rkt
+++ b/collects/plot/common/math.rkt
@@ -1,6 +1,7 @@
-#lang racket
+#lang racket/base
 
-(require racket/contract racket/unsafe/ops
+(require racket/math racket/string racket/match racket/list racket/vector
+         racket/contract racket/unsafe/ops
          unstable/flonum unstable/latent-contract/defthing)
 
 (provide (all-defined-out))
diff --git a/collects/plot/common/worker-thread.rkt b/collects/plot/common/worker-thread.rkt
index 5edb0744f7..8514ffa44a 100644
--- a/collects/plot/common/worker-thread.rkt
+++ b/collects/plot/common/worker-thread.rkt
@@ -1,6 +1,6 @@
-#lang racket
+#lang racket/base
 
-(require racket/async-channel)
+(require racket/bool racket/match racket/async-channel)
 
 (provide make-worker-thread worker-thread? worker-thread-working? worker-thread-waiting?
          worker-thread-put worker-thread-try-put