diff --git a/casacore-data.rb b/casacore-data.rb
index 43cae02..7764194 100644
--- a/casacore-data.rb
+++ b/casacore-data.rb
@@ -1,5 +1,3 @@
-require 'formula'
-
 class CasacoreData < Formula
   desc 'Ephemerides and geodetic data for casacore measures (via ATNF)'
   homepage 'https://github.com/casacore/casacore'
diff --git a/casarest.rb b/casarest.rb
index 31d23b8..d3119de 100644
--- a/casarest.rb
+++ b/casarest.rb
@@ -1,5 +1,3 @@
-require 'formula'
-
 class Casarest < Formula
   desc 'The light-weight imager (lwimager) for radio astronomy'
   homepage 'https://github.com/ska-sa/meqtrees/wiki/LinkingWithCasaCore'
diff --git a/cattery.rb b/cattery.rb
index c470d66..08f9def 100644
--- a/cattery.rb
+++ b/cattery.rb
@@ -1,5 +1,3 @@
-require 'formula'
-
 class Cattery < Formula
   desc 'MeqTrees-based frameworks for interferometer simulation and calibration'
   homepage 'http://meqtrees.net'
diff --git a/leo.rb b/leo.rb
index 24be5d7..04cb0d6 100644
--- a/leo.rb
+++ b/leo.rb
@@ -1,5 +1,3 @@
-require 'formula'
-
 class Leo < Formula
   desc 'A full-featured outliner, IDE and data manager written in Python'
   homepage 'http://leoeditor.com/'
diff --git a/libwww.rb b/libwww.rb
index 349948f..7273c80 100644
--- a/libwww.rb
+++ b/libwww.rb
@@ -1,5 +1,3 @@
-require 'formula'
-
 class Libwww < Formula
   desc 'A highly modular, general-purpose client side Web API written in C'
   homepage 'http://www.w3.org/Library/'
diff --git a/makems.rb b/makems.rb
index b7bc0b2..ab08695 100644
--- a/makems.rb
+++ b/makems.rb
@@ -1,5 +1,3 @@
-require 'formula'
-
 class Makems < Formula
   desc 'Make CASA MeasurementSets from scratch'
   homepage 'https://github.com/ska-sa/meqtrees/wiki/BuildingMakeMs'
diff --git a/meqtrees.rb b/meqtrees.rb
index 1516346..848b925 100644
--- a/meqtrees.rb
+++ b/meqtrees.rb
@@ -1,5 +1,3 @@
-require 'formula'
-
 class Meqtrees < Formula
   desc 'A system for implementing and solving arbitrary Measurement Equations'
   homepage 'http://meqtrees.net/'
diff --git a/owlcat.rb b/owlcat.rb
index 6802f79..eac19c2 100644
--- a/owlcat.rb
+++ b/owlcat.rb
@@ -1,5 +1,3 @@
-require 'formula'
-
 class Owlcat < Formula
   desc 'Miscellaneous scripts for manipulating radio interferometry data'
   homepage 'http://www.astron.nl/meqwiki-data/users/oms/Owlcat-plotms-tutorial.purrlog/'
diff --git a/purr.rb b/purr.rb
index 4524f17..05fdd04 100644
--- a/purr.rb
+++ b/purr.rb
@@ -1,5 +1,3 @@
-require 'formula'
-
 class Purr < Formula
   desc 'A GUI tool for auto-generating descriptive data processing logs'
   homepage 'https://github.com/ska-sa/meqtrees/wiki/Purr-Introduction'
diff --git a/pyrap.rb b/pyrap.rb
index c66a0c0..bbd2a3d 100644
--- a/pyrap.rb
+++ b/pyrap.rb
@@ -1,5 +1,3 @@
-require 'formula'
-
 class Pyrap < Formula
   desc 'Python bindings for casacore, a library used in radio astronomy'
   homepage 'https://casacore.github.io/python-casacore/'
diff --git a/rpfits.rb b/rpfits.rb
index 96ee5d0..662fefc 100644
--- a/rpfits.rb
+++ b/rpfits.rb
@@ -1,5 +1,3 @@
-require 'formula'
-
 class Rpfits < Formula
   desc 'Library to access ATCA visibility data in RPFITS format'
   homepage 'http://www.atnf.csiro.au/computing/software/rpfits.html'
diff --git a/tigger.rb b/tigger.rb
index 1434bf6..0a85a09 100644
--- a/tigger.rb
+++ b/tigger.rb
@@ -1,5 +1,3 @@
-require 'formula'
-
 class Tigger < Formula
   desc 'A FITS viewer and sky model management tool (part of MeqTrees)'
   homepage 'https://github.com/ska-sa/meqtrees/wiki/Tigger'