diff --git a/valgrind-3.10.0-fcvtmu.patch b/valgrind-3.10.0-fcvtmu.patch
new file mode 100644
index 0000000..617b088
--- /dev/null
+++ b/valgrind-3.10.0-fcvtmu.patch
@@ -0,0 +1,21 @@
+commit 9a20b6daf975d94f24d8c2688eb0159c7e651ff6
+Author: sewardj <sewardj@8f6e269a-dfd6-0310-a8e1-e2731360e62c>
+Date:   Thu Oct 30 15:54:53 2014 +0000
+
+    Implement fcvtmu x_d.  Fixes #339927.
+    
+    
+    git-svn-id: svn://svn.valgrind.org/vex/trunk@2982 8f6e269a-dfd6-0310-a8e1-e2731360e62c
+
+diff --git a/VEX/priv/guest_arm64_toIR.c b/VEX/priv/guest_arm64_toIR.c
+index 0377139..23aea80 100644
+--- a/VEX/priv/guest_arm64_toIR.c
++++ b/VEX/priv/guest_arm64_toIR.c
+@@ -12241,6 +12241,7 @@ Bool dis_AdvSIMD_fp_to_from_int_conv(/*MB_OUT*/DisResult* dres, UInt insn)
+           || (iop == Iop_F64toI64S && irrm == Irrm_PosINF) /* FCVTPS Xd,Dn */
+           /* F64toI64U */
+           || (iop == Iop_F64toI64U && irrm == Irrm_ZERO)   /* FCVTZU Xd,Dn */
++          || (iop == Iop_F64toI64U && irrm == Irrm_NegINF) /* FCVTMU Xd,Dn */
+           || (iop == Iop_F64toI64U && irrm == Irrm_PosINF) /* FCVTPU Xd,Dn */
+          ) {
+         /* validated */
diff --git a/valgrind.spec b/valgrind.spec
index 87424f4..b60229f 100644
--- a/valgrind.spec
+++ b/valgrind.spec
@@ -76,6 +76,9 @@ Patch7: valgrind-3.10.0-aarch64-dmb-sy.patch
 # KDE#339926 Implement frintx d_d and s_s.
 Patch8: valgrind-3.10.0-aarch64-frint.patch
 
+# KDE#339927 Implement fcvtmu x_d.
+Patch9: valgrind-3.10.0-fcvtmu.patch
+
 %if %{build_multilib}
 # Ensure glibc{,-devel} is installed for both multilib arches
 BuildRequires: /lib/libc.so.6 /usr/lib/libc.so /lib64/libc.so.6 /usr/lib64/libc.so
@@ -182,6 +185,7 @@ Valgrind User Manual for details.
 %patch6 -p1
 %patch7 -p1
 %patch8 -p1
+%patch9 -p1
 
 %build
 # We need to use the software collection compiler and binutils if available.
@@ -337,6 +341,7 @@ echo ===============END TESTING===============
   add fdatasync, msync, pread64, setreuid, setregid,
   mknodat, fchdir, chroot, fchownat, fchmod and fchown.
 - Add valgrind-3.10.0-aarch64-frint.patch
+- Add valgrind-3.10.0-fcvtmu.patch
 
 * Sat Oct 11 2014 Mark Wielaard <mjw@redhat.com> - 3.10.0-4
 - Add valgrind-3.10.0-aarch64-times.patch