diff --git a/Formula/gazebo9.rb b/Formula/gazebo9.rb
index 96500a676..533336e71 100644
--- a/Formula/gazebo9.rb
+++ b/Formula/gazebo9.rb
@@ -4,12 +4,13 @@ class Gazebo9 < Formula
   url "https://osrf-distributions.s3.amazonaws.com/gazebo/releases/gazebo-9.15.0.tar.bz2"
   sha256 "e91eba92341995db2536b23e323a8f10ef8e9c75837df603ca512e3b21646f27"
   license "Apache-2.0"
+  revision 1
 
   head "https://github.com/osrf/gazebo", branch: "gazebo9"
 
   bottle do
     root_url "https://osrf-distributions.s3.amazonaws.com/bottles-simulation"
-    sha256 "7b3467c278cb17adaca58011ebb3e321db1efd24647a09dd701b4faf3b5bf043" => :mojave
+    sha256 "ef002ad4bc83ed4a6d49f1c4d19ba1d8a8436c56014edc0a100fb690e3c988e4" => :mojave
   end
 
   depends_on "cmake" => :build
@@ -55,6 +56,12 @@ class Gazebo9 < Formula
   conflicts_with "gazebo10", because: "differing version of the same formula"
   conflicts_with "gazebo11", because: "differing version of the same formula"
 
+  patch do
+    # Fix for compatibility with boost 1.74
+    url "https://github.com/osrf/gazebo/commit/c2fd34c00f4611d149aae5479dc4d98fe639805b.patch?full_index=1"
+    sha256 "75ccd13714d39a0e1f1ecb882ad6fea1f15025d2e102fee79053fe88ef25bf4e"
+  end
+
   patch do
     # Fix build when homebrew python is installed
     # keep this patch