diff --git a/genrand-return-value.patch b/genrand-return-value.patch
new file mode 100644
index 0000000..ed79a3e
--- /dev/null
+++ b/genrand-return-value.patch
@@ -0,0 +1,12 @@
+diff -ruN scrub-2.5.2.orig/src/genrand.c scrub-2.5.2/src/genrand.c
+--- scrub-2.5.2.orig/src/genrand.c	2012-06-21 00:00:27.000000000 +0200
++++ scrub-2.5.2/src/genrand.c	2020-11-27 13:57:59.866410480 +0100
+@@ -106,7 +106,7 @@
+                 buf[n] = result;
+             }
+ #endif
+-            return;
++            return 0;
+         }
+     }
+ 
diff --git a/scrub.spec b/scrub.spec
index 6ee694b..2dacfbb 100644
--- a/scrub.spec
+++ b/scrub.spec
@@ -1,11 +1,14 @@
 Name:		scrub
 Version:	2.5.2
-Release:	17%{?dist}
+Release:	18%{?dist}
 Summary:	Disk scrubbing program
 License:	GPLv2+
 URL:		http://code.google.com/p/diskscrub/
 Source0:	http://diskscrub.googlecode.com/files/%{name}-%{version}.tar.bz2
 
+Patch0:		genrand-return-value.patch
+
+BuildRequires: make
 BuildRequires:  gcc
 %description
 Scrub writes patterns on files or disk devices to make
@@ -19,12 +22,14 @@ the file system is full, then scrubbed as in 2).
 %prep
 %setup -q
 
+%autopatch -p1
+
 %build
 %configure
-make %{?_smp_mflags}
+%{make_build}
 
 %install
-make DESTDIR=%{buildroot} install
+%{make_install}
 
 %files
 %doc DISCLAIMER COPYING
@@ -33,6 +38,9 @@ make DESTDIR=%{buildroot} install
 %{_mandir}/man1/scrub.1*
 
 %changelog
+* Wed Jan 27 2021 Fedora Release Engineering <releng@fedoraproject.org> - 2.5.2-18
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_34_Mass_Rebuild
+
 * Wed Jul 29 2020 Fedora Release Engineering <releng@fedoraproject.org> - 2.5.2-17
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild