diff --git a/pkgs/typed-racket-pkgs/typed-racket-lib/typed-racket/optimizer/sequence.rkt b/pkgs/typed-racket-pkgs/typed-racket-lib/typed-racket/optimizer/sequence.rkt
index 5801a763..a18d1f22 100644
--- a/pkgs/typed-racket-pkgs/typed-racket-lib/typed-racket/optimizer/sequence.rkt
+++ b/pkgs/typed-racket-pkgs/typed-racket-lib/typed-racket/optimizer/sequence.rkt
@@ -91,4 +91,10 @@
                            0
                            (lambda (x) (unsafe-fx< x end))
                            (lambda (x) #t)
-                           (lambda (x y) #t)))))
+                           (lambda (x y) #t))))
+  (pattern (#%plain-app op:make-sequence arg:opt-expr s:opt-expr)
+    #:do [(log-missed-optimization
+           "non-specialized for clause"
+           "Typed Racket failed to specialize this `for' clause, which introduces run-time dispatch overhead. You can avoid this by limiting the sequence's type to a single kind of sequence (e.g. lists, vectors, or integers) or specializing the sequence manually (e.g. by wrapping it in an `in-list', `in-vector' or `in-range')."
+           #'s)]
+    #:with opt #'(op arg.opt s.opt)))
diff --git a/pkgs/typed-racket-pkgs/typed-racket-test/tests/typed-racket/optimizer/missed-optimizations/marketplace-struct.rkt b/pkgs/typed-racket-pkgs/typed-racket-test/tests/typed-racket/optimizer/missed-optimizations/marketplace-struct.rkt
index b2f668b5..b823bf08 100644
--- a/pkgs/typed-racket-pkgs/typed-racket-test/tests/typed-racket/optimizer/missed-optimizations/marketplace-struct.rkt
+++ b/pkgs/typed-racket-pkgs/typed-racket-test/tests/typed-racket/optimizer/missed-optimizations/marketplace-struct.rkt
@@ -1,24 +1,28 @@
 #;#;
 #<<END
-TR info: marketplace-struct.rkt 113:39 process -- struct constructor
-TR info: marketplace-struct.rkt 120:3 vm -- struct constructor
-TR info: marketplace-struct.rkt 62:9 vm -- struct constructor
-TR info: marketplace-struct.rkt 62:9 vm -- struct constructor
-TR opt: marketplace-struct.rkt 127:2 (struct-copy vm state (processes (hash-set (vm-processes state) (Process-pid wp) wp))) -- dead else branch
-TR opt: marketplace-struct.rkt 127:2 (struct-copy vm state (processes (hash-set (vm-processes state) (Process-pid wp) wp))) -- struct ref
-TR opt: marketplace-struct.rkt 127:45 (vm-processes state) -- struct ref
-TR opt: marketplace-struct.rkt 134:23 (vm-processes state) -- struct ref
-TR opt: marketplace-struct.rkt 135:10 (if wp (struct-copy vm state (processes (hash-remove (vm-processes state) pid))) state) -- dead else branch
-TR opt: marketplace-struct.rkt 135:10 (if wp (struct-copy vm state (processes (hash-remove (vm-processes state) pid))) state) -- struct ref
-TR opt: marketplace-struct.rkt 136:60 (vm-processes state) -- struct ref
-TR opt: marketplace-struct.rkt 142:48 (vm-processes state) -- struct ref
-TR opt: marketplace-struct.rkt 151:46 (vm-processes state) -- struct ref
-TR opt: marketplace-struct.rkt 156:60 (process-endpoints p) -- struct ref
-TR opt: marketplace-struct.rkt 156:60 (process-endpoints p) -- struct ref
-TR opt: marketplace-struct.rkt 157:35 (process-endpoints p) -- struct ref
-TR opt: marketplace-struct.rkt 157:35 (process-endpoints p) -- struct ref
-TR opt: marketplace-struct.rkt 157:35 (process-endpoints p) -- struct ref
-TR opt: marketplace-struct.rkt 157:35 (process-endpoints p) -- struct ref
+TR info: marketplace-struct.rkt 117:39 process -- struct constructor
+TR info: marketplace-struct.rkt 124:3 vm -- struct constructor
+TR info: marketplace-struct.rkt 66:9 vm -- struct constructor
+TR info: marketplace-struct.rkt 66:9 vm -- struct constructor
+TR missed opt: marketplace-struct.rkt 146:34 (in-hash-keys (vm-processes state)) -- non-specialized for clause
+TR missed opt: marketplace-struct.rkt 155:32 (in-hash-keys (vm-processes state)) -- non-specialized for clause
+TR missed opt: marketplace-struct.rkt 160:46 (in-hash-keys (process-endpoints p)) -- non-specialized for clause
+TR missed opt: marketplace-struct.rkt 160:46 (in-hash-keys (process-endpoints p)) -- non-specialized for clause
+TR opt: marketplace-struct.rkt 131:2 (struct-copy vm state (processes (hash-set (vm-processes state) (Process-pid wp) wp))) -- dead else branch
+TR opt: marketplace-struct.rkt 131:2 (struct-copy vm state (processes (hash-set (vm-processes state) (Process-pid wp) wp))) -- struct ref
+TR opt: marketplace-struct.rkt 131:45 (vm-processes state) -- struct ref
+TR opt: marketplace-struct.rkt 138:23 (vm-processes state) -- struct ref
+TR opt: marketplace-struct.rkt 139:10 (if wp (struct-copy vm state (processes (hash-remove (vm-processes state) pid))) state) -- dead else branch
+TR opt: marketplace-struct.rkt 139:10 (if wp (struct-copy vm state (processes (hash-remove (vm-processes state) pid))) state) -- struct ref
+TR opt: marketplace-struct.rkt 140:60 (vm-processes state) -- struct ref
+TR opt: marketplace-struct.rkt 146:48 (vm-processes state) -- struct ref
+TR opt: marketplace-struct.rkt 155:46 (vm-processes state) -- struct ref
+TR opt: marketplace-struct.rkt 160:60 (process-endpoints p) -- struct ref
+TR opt: marketplace-struct.rkt 160:60 (process-endpoints p) -- struct ref
+TR opt: marketplace-struct.rkt 161:35 (process-endpoints p) -- struct ref
+TR opt: marketplace-struct.rkt 161:35 (process-endpoints p) -- struct ref
+TR opt: marketplace-struct.rkt 161:35 (process-endpoints p) -- struct ref
+TR opt: marketplace-struct.rkt 161:35 (process-endpoints p) -- struct ref
 END
 ""
 #lang typed/racket/base
diff --git a/pkgs/typed-racket-pkgs/typed-racket-test/tests/typed-racket/optimizer/missed-optimizations/sequence.rkt b/pkgs/typed-racket-pkgs/typed-racket-test/tests/typed-racket/optimizer/missed-optimizations/sequence.rkt
new file mode 100644
index 00000000..dcfd654b
--- /dev/null
+++ b/pkgs/typed-racket-pkgs/typed-racket-test/tests/typed-racket/optimizer/missed-optimizations/sequence.rkt
@@ -0,0 +1,11 @@
+#;#;
+#<<END
+TR missed opt: sequence.rkt 10:22 s -- non-specialized for clause
+END
+""
+#lang typed/racket/base
+
+(: seq-generic : (Sequenceof Integer) -> Void)
+(define (seq-generic s)
+  (for: ([x : Integer s])
+    (void)))