diff --git a/fixrace.patch b/fixrace.patch
new file mode 100644
index 0000000..8eb2438
--- /dev/null
+++ b/fixrace.patch
@@ -0,0 +1,43 @@
+From: Bernhard M. Wiedemann <bmwiedemann+intltool@suse.de>
+
+avoid a race where some processes try to use a partial cache file
+that is still being written to.
+Note that we release the lock before load_cache,
+because if we got the lock, the cache is already completely written
+and it is OK to have multiple parallel readers
+
+Index: intltool-0.51.0/intltool-merge.in
+===================================================================
+--- intltool-0.51.0.orig/intltool-merge.in
++++ intltool-0.51.0/intltool-merge.in
+@@ -43,6 +43,7 @@ use Getopt::Long;
+ use Text::Wrap;
+ use File::Basename;
+ use Encode;
++use Fcntl qw(:flock);
+ 
+ my $must_end_tag      = -1;
+ my $last_depth        = -1;
+@@ -392,11 +393,14 @@ sub load_cache
+ 
+ sub get_cached_translation_database
+ {
++    open(my $lockfh, ">", "$cache_file.lock") or die $!;
++    flock($lockfh, LOCK_EX) or die "Could not lock '$cache_file.lock' - $!";
+     my $cache_file_age = -M $cache_file;
+     if (defined $cache_file_age) 
+     {
+         if ($cache_file_age <= &get_newest_po_age) 
+         {
++            close($lockfh);
+             &load_cache;
+             return;
+         }
+@@ -404,6 +408,7 @@ sub get_cached_translation_database
+     }
+ 
+     &create_cache;
++    close($lockfh);
+ }
+ 
+ sub add_translation
diff --git a/intltool.changes b/intltool.changes
index 4766545..f92d35a 100644
--- a/intltool.changes
+++ b/intltool.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Tue May  2 15:22:35 UTC 2017 - bwiedemann@suse.com
+
+- Add fixrace.patch to fix random desktop file corruptions
+  (lp#1687644 boo#1021335)
+
 -------------------------------------------------------------------
 Fri Apr 15 22:26:26 UTC 2016 - mgorse@suse.com
 
diff --git a/intltool.spec b/intltool.spec
index 4368f78..010292f 100644
--- a/intltool.spec
+++ b/intltool.spec
@@ -32,6 +32,8 @@ Url:            https://edge.launchpad.net/intltool/
 Source:         https://launchpad.net/%{name}/trunk/%{version}/+download/%{name}-%{version}.tar.gz
 # PATCH-FIX-UPSTREAM intltool-perl-5.22.patch lp#1490906 dimstar@opensuse.org -- Fix execution with perl 5.22
 Patch0:         intltool-perl-5.22.patch
+# PATCH-FIX-UPSTREAM fixrace.patch lp#1687644 boo#1021335
+Patch1:         fixrace.patch
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 
 %description
@@ -43,6 +45,7 @@ information is written back into the XML files.
 %prep
 %setup -q
 %patch0 -p0
+%patch1 -p1
 
 %build
 %configure