diff --git a/basis/classes/struct/struct-tests.factor b/basis/classes/struct/struct-tests.factor
index 79018f577b..54dbc8dcaf 100644
--- a/basis/classes/struct/struct-tests.factor
+++ b/basis/classes/struct/struct-tests.factor
@@ -8,7 +8,7 @@ destructors io.encodings.utf8 io.pathnames io.streams.string
 kernel libc literals math mirrors namespaces prettyprint
 prettyprint.config see sequences specialized-arrays system
 tools.test parser lexer eval layouts generic.single classes
-vocabs ;
+vocabs generic ;
 FROM: math => float ;
 FROM: specialized-arrays.private => specialized-array-vocab ;
 QUALIFIED-WITH: alien.c-types c
@@ -534,3 +534,13 @@ IN: classes.struct.tests
 STRUCT: struct-1-union { a int initial: 0 } ;
 " ]
 [ \ struct-1-union [ see ] with-string-writer ] unit-test
+
+
+! Bug #206
+STRUCT: going-to-forget { a uint } ;
+[ ] [
+    "IN: classes.struct.tests TUPLE: going-to-forget b ;" eval( -- )
+] unit-test
+[ f ] [ "USE: classes.struct.tests M\\ going-to-forget clone" eval( -- obj ) ] unit-test
+[ f ] [ "USE: classes.struct.tests M\\ going-to-forget struct-slot-values" eval( -- obj ) ] unit-test
+
diff --git a/basis/classes/struct/struct.factor b/basis/classes/struct/struct.factor
index adb9f330d4..db26f4d209 100644
--- a/basis/classes/struct/struct.factor
+++ b/basis/classes/struct/struct.factor
@@ -8,7 +8,8 @@ combinators combinators.smart cpu.architecture fry
 functors.backend generalizations generic.parser kernel
 kernel.private lexer libc locals macros math math.order parser
 quotations sequences slots slots.private specialized-arrays
-stack-checker.dependencies summary vectors vocabs.parser words ;
+stack-checker.dependencies summary vectors vocabs.parser words
+classes.private generic definitions ;
 FROM: delegate.private => group-words slot-group-words ;
 QUALIFIED: math
 IN: classes.struct
@@ -194,6 +195,9 @@ M: struct-c-type base-type ;
     [ \ struct-slot-values ] [ struct-slot-values-quot ] bi
     define-inline-method ;
 
+: forget-struct-slot-values-method ( class -- )
+    \ struct-slot-values method forget ;
+
 : clone-underlying ( struct -- byte-array )
     binary-object memory>byte-array ; inline
 
@@ -202,6 +206,9 @@ M: struct-c-type base-type ;
     [ \ clone-underlying swap literalize \ memory>struct [ ] 3sequence ] bi
     define-inline-method ;
 
+: forget-clone-method ( class -- )
+    \ clone method forget ;
+
 :: c-type-for-class ( class slots size align -- c-type )
     struct-c-type new
         byte-array >>class
@@ -314,6 +321,14 @@ ERROR: invalid-struct-slot token ;
     c-type c-type-boxed-class
     dup \ byte-array = [ drop \ c-ptr ] when ;
 
+M: struct-class reset-class
+    [ call-next-method ]
+    [
+        [ forget-struct-slot-values-method ]
+        [ forget-clone-method ] bi
+    ]
+    [ { "c-type" "layout" "struct-size" } reset-props ] tri ;
+
 SYMBOL: bits:
 
 <PRIVATE