diff --git a/ninja-re2c-g.patch b/ninja-re2c-g.patch
new file mode 100644
index 0000000..7e47e82
--- /dev/null
+++ b/ninja-re2c-g.patch
@@ -0,0 +1,11 @@
+--- configure.py.orig
++++ configure.py
+@@ -479,7 +479,7 @@
+         return False
+ if has_re2c():
+     n.rule('re2c',
+-           command='re2c -b -i --no-generation-date -o $out $in',
++           command='re2c -g -b -i --no-generation-date -o $out $in',
+            description='RE2C $out')
+     # Generate the .cc files in the source directory so we can check them in.
+     n.build(src('depfile_parser.cc'), 're2c', src('depfile_parser.in.cc'))
diff --git a/ninja.changes b/ninja.changes
index ffc419a..5bfe0fc 100644
--- a/ninja.changes
+++ b/ninja.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Mon Apr  5 21:51:58 UTC 2021 - Cristian Rodríguez <crrodriguez@opensuse.org>
+
+- ninja-re2c-g.patch tell re2c to generate gcc specific code using
+  the -g flag, this usually results in lexers that are 20-25% faster.
+
 -------------------------------------------------------------------
 Tue Dec 29 18:55:10 UTC 2020 - Dirk Müller <dmueller@suse.com>
 
diff --git a/ninja.spec b/ninja.spec
index 5f1d13d..1b5f61a 100644
--- a/ninja.spec
+++ b/ninja.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package ninja
 #
-# Copyright (c) 2020 SUSE LLC
+# Copyright (c) 2021 SUSE LLC
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -26,6 +26,7 @@ URL:            https://ninja-build.org/
 Source0:        https://github.com/ninja-build/ninja/archive/v%{version}.tar.gz#/%{name}-%{version}.tar.gz
 Source1:        macros.ninja
 Patch1:         ninja-disable-maxprocs-test.patch
+Patch2:         ninja-re2c-g.patch
 BuildRequires:  gcc-c++
 BuildRequires:  python3-base
 BuildRequires:  re2c