diff --git a/rkerberos-0.1.5-gcc8-argnum-fix.patch b/rkerberos-0.1.5-gcc8-argnum-fix.patch
new file mode 100644
index 0000000..8367794
--- /dev/null
+++ b/rkerberos-0.1.5-gcc8-argnum-fix.patch
@@ -0,0 +1,11 @@
+--- rkerberos-0.1.5/ext/rkerberos/policy.c.gcc8	2018-02-18 21:46:03.540309315 +0900
++++ rkerberos-0.1.5/ext/rkerberos/policy.c	2018-02-18 21:47:03.031183592 +0900
+@@ -49,7 +49,7 @@ static VALUE rkadm5_policy_init(VALUE se
+ 
+   Check_Type(v_options, T_HASH);
+ 
+-  if(RTEST(rb_funcall(v_options, rb_intern("empty?"), 0, 0)))
++  if(RTEST(rb_funcall(v_options, rb_intern("empty?"), 0)))
+     rb_raise(rb_eArgError, "no policy options provided");
+ 
+   v_name       = rb_hash_aref2(v_options, "name");
diff --git a/rubygem-rkerberos.spec b/rubygem-rkerberos.spec
index a09558e..2899d86 100644
--- a/rubygem-rkerberos.spec
+++ b/rubygem-rkerberos.spec
@@ -14,11 +14,13 @@ Summary: A Ruby interface for the the Kerberos library
 Name: %{?scl_prefix}rubygem-%{gem_name}
 
 Version: 0.1.5
-Release: 10%{?dist}
+Release: 11%{?dist}
 Group: Development/Languages
 License: Artistic 2.0
 URL: http://github.com/domcleal/rkerberos
 Source0: http://rubygems.org/downloads/%{gem_name}-%{version}.gem
+# Patch to compile with gcc8 + ruby 2.5 wrt rb_funcall argument num fix
+Patch0:  rkerberos-0.1.5-gcc8-argnum-fix.patch
 
 %if 0%{?scl} || 0%{?fedora} > 20
 Requires: %{?scl_prefix}ruby
@@ -61,6 +63,7 @@ gem unpack %{SOURCE0}
 %{?scl:"}
 
 %setup -q -D -T -n  %{gem_name}-%{version}
+%patch0 -p1
 
 %{?scl:scl enable %{scl} "}
 gem spec %{SOURCE0} -l --ruby > %{gem_name}.gemspec
@@ -130,6 +133,9 @@ popd
 
 
 %changelog
+* Sun Feb 18 2018 Mamoru TASAKA <mtasaka@fedoraproject.org> - 0.1.5-11
+- Patch to compile with gcc8 + ruby25 wrt rb_funcall argument num fix
+
 * Fri Feb 09 2018 Fedora Release Engineering <releng@fedoraproject.org> - 0.1.5-10
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild