diff --git a/basis/alien/data/data.factor b/basis/alien/data/data.factor
index 7191dcc718..8066c73606 100644
--- a/basis/alien/data/data.factor
+++ b/basis/alien/data/data.factor
@@ -98,7 +98,6 @@ M:: memory-stream stream-read-unsafe ( n buf stream -- count )
     buf src n memcpy
     n src <displaced-alien> stream alien<<
     n ; inline
-M: memory-stream stream-read-partial-unsafe stream-read-unsafe ; inline
 
 M: value-type c-type-rep drop int-rep ;
 
diff --git a/basis/io/streams/string/string.factor b/basis/io/streams/string/string.factor
index 909fed2092..442a799ff4 100644
--- a/basis/io/streams/string/string.factor
+++ b/basis/io/streams/string/string.factor
@@ -10,7 +10,6 @@ IN: io.streams.string
 TUPLE: string-reader { underlying string read-only } { i array-capacity } ;
 
 M: string-reader stream-element-type drop +character+ ;
-M: string-reader stream-read-partial-unsafe sequence-read-unsafe ;
 M: string-reader stream-read-unsafe sequence-read-unsafe ;
 M: string-reader stream-read1 sequence-read1 ;
 M: string-reader stream-read-until sequence-read-until ;
diff --git a/core/io/encodings/encodings.factor b/core/io/encodings/encodings.factor
index 6750ad5c42..7de56589c8 100644
--- a/core/io/encodings/encodings.factor
+++ b/core/io/encodings/encodings.factor
@@ -99,8 +99,6 @@ M: decoder stream-read-unsafe ( n buf decoder -- count )
         ] [ 2drop 2drop 0 ] if*
     ] if ; inline
 
-M: decoder stream-read-partial-unsafe stream-read-unsafe ; inline
-
 : line-ends/eof ( stream str -- str ) f like swap cr- ; inline
 
 : line-ends\r ( stream str -- str ) swap cr+ ; inline
diff --git a/core/io/streams/byte-array/byte-array.factor b/core/io/streams/byte-array/byte-array.factor
index 89f838a675..3c880a8e38 100644
--- a/core/io/streams/byte-array/byte-array.factor
+++ b/core/io/streams/byte-array/byte-array.factor
@@ -18,7 +18,6 @@ TUPLE: byte-reader { underlying byte-array read-only } { i array-capacity } ;
 
 M: byte-reader stream-element-type drop +byte+ ;
 
-M: byte-reader stream-read-partial-unsafe sequence-read-unsafe ;
 M: byte-reader stream-read-unsafe sequence-read-unsafe ;
 M: byte-reader stream-read1 sequence-read1 ;
 M: byte-reader stream-read-until sequence-read-until ;
diff --git a/core/io/streams/c/c.factor b/core/io/streams/c/c.factor
index ac02132bf5..a78e21d2d9 100644
--- a/core/io/streams/c/c.factor
+++ b/core/io/streams/c/c.factor
@@ -47,8 +47,6 @@ M: c-reader stream-element-type drop +byte+ ;
 
 M: c-reader stream-read-unsafe dup check-disposed handle>> fread-unsafe ;
 
-M: c-reader stream-read-partial-unsafe stream-read-unsafe ;
-
 M: c-reader stream-read1 dup check-disposed handle>> fgetc ;
 
 : read-until-loop ( stream delim -- ch )
diff --git a/extra/io/streams/peek/peek.factor b/extra/io/streams/peek/peek.factor
index 2137a88383..ab0085c6d2 100644
--- a/extra/io/streams/peek/peek.factor
+++ b/extra/io/streams/peek/peek.factor
@@ -52,8 +52,6 @@ M:: peek-stream stream-read-unsafe ( n buf stream -- count )
         ] if
     ] if ;
 
-M: peek-stream stream-read-partial-unsafe stream-read-unsafe ;
-
 : peek-stream-read-until ( stream seps buf -- stream seps buf sep/f )
     3dup [ [ stream-read1 dup ] dip member-eq? ] dip swap
     [ drop ] [ over [ push peek-stream-read-until ] [ drop ] if ] if ;