diff --git a/build/Makefile.in b/build/Makefile.in
index 525d61c5fa4..3c1d50cc185 100644
--- a/build/Makefile.in
+++ b/build/Makefile.in
@@ -223,7 +223,6 @@ CORE_SOURCES = \
   src/core/Grammar.pm \
   src/core/Substitution.pm \
   src/core/system.pm \
-  src/cheats/match-bool.pm \
   src/cheats/process.pm \
   src/core/Date.pm \
   src/core/Temporal.pm \
diff --git a/src/cheats/match-bool.pm b/src/cheats/match-bool.pm
deleted file mode 100644
index 2ffd1775a74..00000000000
--- a/src/cheats/match-bool.pm
+++ /dev/null
@@ -1,8 +0,0 @@
-INIT {
-    Regex::Match.^add_method('Bool', method () {
-        self.to >= self.from
-    });
-    Regex::Match.^add_method('defined', method () {
-        self.to >= self.from
-    });
-}
diff --git a/src/core/Match.pm b/src/core/Match.pm
index 0f2bc694be7..335aed0f805 100644
--- a/src/core/Match.pm
+++ b/src/core/Match.pm
@@ -19,6 +19,13 @@ class Match is Regex::Match is Cool does Positional does Associative {
         ~self.Regex::Match::Str;
     }
 
+    method Bool() {
+        $.from < $.to;
+    }
+
+    method defined() {
+        $.from < $.to;
+    }
 
     method at_key($key) {
         Q:PIR {