diff --git a/basis/colors/constants/constants.factor b/basis/colors/constants/constants.factor
index 6f1b3cb951..14d3e0ad1a 100644
--- a/basis/colors/constants/constants.factor
+++ b/basis/colors/constants/constants.factor
@@ -9,7 +9,7 @@ IN: colors.constants
 : parse-color ( line -- name color )
     first4
     [ [ string>number 255 /f ] tri@ 1.0 <rgba> ] dip
-    [ blank? ] trim-head { { CHAR: \s CHAR: - } } substitute swap ;
+    [ blank? ] trim-head H{ { CHAR: \s CHAR: - } } substitute swap ;
 
 : parse-colors ( lines -- assoc )
     [ "!" head? not ] filter
diff --git a/basis/tools/test/test.factor b/basis/tools/test/test.factor
index b85bf2a84a..d36637f36c 100644
--- a/basis/tools/test/test.factor
+++ b/basis/tools/test/test.factor
@@ -77,7 +77,8 @@ M: did-not-fail summary drop "Did not fail" ;
     [ { } quot with-datastack drop did-not-fail t ] [ drop f f ] recover ;
 
 : experiment-title ( word -- string )
-    "(" ?head drop ")" ?tail drop { { CHAR: - CHAR: \s } } substitute >title ;
+    "(" ?head drop ")" ?tail drop
+    H{ { CHAR: - CHAR: \s } } substitute >title ;
 
 MACRO: <experiment> ( word -- )
     [ stack-effect in>> length dup ]
diff --git a/basis/ui/text/pango/pango.factor b/basis/ui/text/pango/pango.factor
index 9b40448737..48868523d8 100644
--- a/basis/ui/text/pango/pango.factor
+++ b/basis/ui/text/pango/pango.factor
@@ -120,7 +120,7 @@ SYMBOL: dpi
 : escape-nulls ( str -- str' )
     #! Replace nulls with something else since Pango uses null-terminated
     #! strings
-    { { 0 CHAR: zero-width-no-break-space } } substitute ;
+    H{ { 0 CHAR: zero-width-no-break-space } } substitute ;
 
 : unpack-selection ( layout string/selection -- layout )
     dup selection? [
diff --git a/basis/ui/tools/listener/completion/completion.factor b/basis/ui/tools/listener/completion/completion.factor
index 6187c64f89..c303c1f34c 100644
--- a/basis/ui/tools/listener/completion/completion.factor
+++ b/basis/ui/tools/listener/completion/completion.factor
@@ -17,7 +17,7 @@ SLOT: history
 
 : history-list ( interactor -- alist )
     history>> elements>>
-    [ dup string>> { { CHAR: \n CHAR: \s } } substitute ] { } map>assoc
+    [ dup string>> H{ { CHAR: \n CHAR: \s } } substitute ] { } map>assoc
     <reversed> ;
 
 : history-completions ( short interactor -- seq )
diff --git a/basis/unicode/data/data.factor b/basis/unicode/data/data.factor
index 830422c767..e8bed172a7 100644
--- a/basis/unicode/data/data.factor
+++ b/basis/unicode/data/data.factor
@@ -158,7 +158,7 @@ PRIVATE>
 
 : process-names ( data -- names-hash )
     1 swap (process-data) [
-        >lower { { CHAR: \s CHAR: - } } substitute swap
+        >lower H{ { CHAR: \s CHAR: - } } substitute swap
     ] H{ } assoc-map-as ;
 
 : multihex ( hexstring -- string )
diff --git a/core/vocabs/loader/loader.factor b/core/vocabs/loader/loader.factor
index 5e097ecc6c..fec916667e 100644
--- a/core/vocabs/loader/loader.factor
+++ b/core/vocabs/loader/loader.factor
@@ -42,7 +42,7 @@ M: string vocab-path ( string -- path/f )
 PRIVATE>
 
 : vocab-dir ( vocab -- dir )
-    vocab-name { { CHAR: . CHAR: / } } substitute ;
+    vocab-name H{ { CHAR: . CHAR: / } } substitute ;
 
 : append-vocab-dir ( vocab str/f -- path )
     [ vocab-name "." split ] dip
diff --git a/extra/mason/platform/platform.factor b/extra/mason/platform/platform.factor
index 0c52a8cd3e..6dd5dc88ce 100644
--- a/extra/mason/platform/platform.factor
+++ b/extra/mason/platform/platform.factor
@@ -5,7 +5,7 @@ mason.config bootstrap.image assocs ;
 IN: mason.platform
 
 : (platform) ( os cpu -- string )
-    { { CHAR: . CHAR: - } } substitute "-" glue ;
+    H{ { CHAR: . CHAR: - } } substitute "-" glue ;
 
 : platform ( -- string )
     target-os get name>> target-cpu get name>> (platform)
diff --git a/extra/svg/svg.factor b/extra/svg/svg.factor
index 2d2d38314a..bebed0a0f8 100644
--- a/extra/svg/svg.factor
+++ b/extra/svg/svg.factor
@@ -10,7 +10,7 @@ XML-NS: sodipodi-name http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd
 XML-NS: inkscape-name http://www.inkscape.org/namespaces/inkscape
 
 : svg-string>number ( string -- number )
-    { { CHAR: E CHAR: e } } substitute "e" split1
+    H{ { CHAR: E CHAR: e } } substitute "e" split1
     [ string>number ] [ [ string>number 10^ ] [ 1 ] if* ] bi* *
     >float ;
 
diff --git a/unmaintained/alien/cxx/cxx.factor b/unmaintained/alien/cxx/cxx.factor
index 9d0ee24f50..1e788d4713 100644
--- a/unmaintained/alien/cxx/cxx.factor
+++ b/unmaintained/alien/cxx/cxx.factor
@@ -24,7 +24,7 @@ PRIVATE>
     add-mixin-instance define-class-tuple ;
 
 :: define-c++-method ( class-name generic name types effect virtual -- )
-    [ name % "_" % class-name { { CHAR: : CHAR: _ } } substitute % ] "" make           :> name'
+    [ name % "_" % class-name H{ { CHAR: : CHAR: _ } } substitute % ] "" make           :> name'
     effect [ in>> "self" suffix ] [ out>> ] bi <effect> :> effect'
     types class-name "*" append suffix                  :> types'
     effect in>> "," join                                :> args
diff --git a/unmaintained/alien/inline/types/types.factor b/unmaintained/alien/inline/types/types.factor
index ac7f6ae17f..fe4e31f1fd 100644
--- a/unmaintained/alien/inline/types/types.factor
+++ b/unmaintained/alien/inline/types/types.factor
@@ -7,7 +7,7 @@ IN: alien.inline.types
 
 : cify-type ( str -- str' )
     dup word? [ name>> ] when
-    { { CHAR: - CHAR: space } } substitute ;
+    H{ { CHAR: - CHAR: space } } substitute ;
 
 : factorize-type ( str -- str' )
     cify-type
diff --git a/unmaintained/alien/marshall/structs/structs.factor b/unmaintained/alien/marshall/structs/structs.factor
index 3f9c8e3a7e..fff84e9c04 100644
--- a/unmaintained/alien/marshall/structs/structs.factor
+++ b/unmaintained/alien/marshall/structs/structs.factor
@@ -41,7 +41,7 @@ PRIVATE>
     name c-type fields>> [
         class swap
         {
-            [ name>> { { CHAR: space CHAR: - } } substitute ]
+            [ name>> H{ { CHAR: space CHAR: - } } substitute ]
             [ type>> ] [ reader>> ] [ writer>> ]
         } cleave define-struct-accessors
     ] each ;