diff --git a/gnu/local.mk b/gnu/local.mk
index 0993c45873..e8ad12295e 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -945,6 +945,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/patchelf-rework-for-arm.patch		\
   %D%/packages/patches/patchutils-xfail-gendiff-tests.patch	\
   %D%/packages/patches/patch-hurd-path-max.patch		\
+  %D%/packages/patches/pcmanfm-CVE-2017-8934.patch		\
   %D%/packages/patches/pcre-CVE-2017-7186.patch			\
   %D%/packages/patches/pcre2-CVE-2017-7186.patch		\
   %D%/packages/patches/pcre2-CVE-2017-8786.patch		\
diff --git a/gnu/packages/lxde.scm b/gnu/packages/lxde.scm
index 44e5da444d..7d0aaa6503 100644
--- a/gnu/packages/lxde.scm
+++ b/gnu/packages/lxde.scm
@@ -215,6 +215,7 @@ speed up the access to freedesktop.org defined application menus.")
               (uri (string-append "mirror://sourceforge/" name "/"
                                   "PCManFM%20%2B%20Libfm%20%28tarball%20release"
                                   "%29/PCManFM/" name "-" version ".tar.xz"))
+              (patches (search-patches "pcmanfm-CVE-2017-8934.patch"))
               (sha256
                (base32
                 "0rxdh0dfzc84l85c54blq42gczygq8adhr3l9hqzy1dp530cm1hc"))))
diff --git a/gnu/packages/patches/pcmanfm-CVE-2017-8934.patch b/gnu/packages/patches/pcmanfm-CVE-2017-8934.patch
new file mode 100644
index 0000000000..489d22c83b
--- /dev/null
+++ b/gnu/packages/patches/pcmanfm-CVE-2017-8934.patch
@@ -0,0 +1,56 @@
+From bc8c3d871e9ecc67c47ff002b68cf049793faf08 Mon Sep 17 00:00:00 2001
+From: Andriy Grytsenko <andrej@rep.kiev.ua>
+Date: Sun, 14 May 2017 21:35:40 +0300
+Subject: [PATCH] Fix potential access violation, use runtime user dir instead
+ of tmp dir.
+
+---
+ NEWS              | 4 ++++
+ src/single-inst.c | 7 ++++++-
+ 2 files changed, 10 insertions(+), 1 deletion(-)
+
+diff --git a/NEWS b/NEWS
+index 8c2049a..876f7f3 100644
+--- a/NEWS
++++ b/NEWS
+@@ -1,3 +1,7 @@
++* Fixed potential access violation, use runtime user dir instead of tmp dir
++    for single instance socket.
++
++
+ Changes on 1.2.5 since 1.2.4:
+ 
+ * Removed options to Cut, Remove and Rename from context menu on mounted
+diff --git a/src/single-inst.c b/src/single-inst.c
+index 62c37b3..aaf84ab 100644
+--- a/src/single-inst.c
++++ b/src/single-inst.c
+@@ -2,7 +2,7 @@
+  *      single-inst.c: simple IPC mechanism for single instance app
+  *
+  *      Copyright 2010 Hong Jen Yee (PCMan) <pcman.tw@gmail.com>
+- *      Copyright 2012 Andriy Grytsenko (LStranger) <andrej@rep.kiev.ua>
++ *      Copyright 2012-2017 Andriy Grytsenko (LStranger) <andrej@rep.kiev.ua>
+  *
+  *      This program is free software; you can redistribute it and/or modify
+  *      it under the terms of the GNU General Public License as published by
+@@ -404,11 +404,16 @@ static void get_socket_name(SingleInstData* data, char* buf, int len)
+     }
+     else
+         dpynum = 0;
++#if GLIB_CHECK_VERSION(2, 28, 0)
++    g_snprintf(buf, len, "%s/%s-socket-%s-%d", g_get_user_runtime_dir(),
++               data->prog_name, host ? host : "", dpynum);
++#else
+     g_snprintf(buf, len, "%s/.%s-socket-%s-%d-%s",
+                 g_get_tmp_dir(),
+                 data->prog_name,
+                 host ? host : "",
+                 dpynum,
+                 g_get_user_name());
++#endif
+ }
+ 
+-- 
+2.1.4
+