diff --git a/Formula/gmt@4.rb b/Formula/gmt@4.rb
index 7217270698..9b8084b96d 100644
--- a/Formula/gmt@4.rb
+++ b/Formula/gmt@4.rb
@@ -5,7 +5,7 @@ class GmtAT4 < Formula
   mirror "https://fossies.org/linux/misc/GMT/gmt-4.5.18-src.tar.bz2"
   mirror "https://mirrors.ustc.edu.cn/gmt/gmt-4.5.18-src.tar.bz2"
   sha256 "27c30b516c317fed8e44efa84a0262f866521d80cfe76a61bf12952efb522b63"
-  revision 3
+  revision 4
 
   bottle do
     sha256 "9d6f98d1a03ca89560c99f5559c3961b4cef7791ea0fcffbf3b6b2df87431e45" => :mojave