diff --git a/patches/ffmpeg_scalar_product_remove_alignment_hints.patch b/patches/ffmpeg_scalar_product_remove_alignment_hints.patch
new file mode 100644
index 000000000..6d9b48650
--- /dev/null
+++ b/patches/ffmpeg_scalar_product_remove_alignment_hints.patch
@@ -0,0 +1,30 @@
+--- submodules/externals/ffmpeg/libavcodec/arm/int_neon.S.orig	2011-09-30 19:43:21.935593025 +0200
++++ submodules/externals/ffmpeg/libavcodec/arm/int_neon.S	2011-09-30 19:44:21.115168033 +0200
+@@ -35,11 +35,11 @@
+ 
+         vdup.s32        q12, r3
+ 1:      vld1.16         {d16-d17}, [r0]!
+-        vld1.16         {d20-d21}, [r1,:128]!
++        vld1.16         {d20-d21}, [r1]!
+         vmull.s16       q12, d16,  d20
+         vld1.16         {d18-d19}, [r0]!
+         vmull.s16       q13, d17,  d21
+-        vld1.16         {d22-d23}, [r1,:128]!
++        vld1.16         {d22-d23}, [r1]!
+         vmull.s16       q14, d18,  d22
+         vmull.s16       q15, d19,  d23
+         vshl.s32        q8,  q12,  q12
+@@ -55,11 +55,11 @@
+         b               3f
+ 
+ 2:      vld1.16         {d16-d17}, [r0]!
+-        vld1.16         {d20-d21}, [r1,:128]!
++        vld1.16         {d20-d21}, [r1]!
+         vmlal.s16       q0,  d16,  d20
+         vld1.16         {d18-d19}, [r0]!
+         vmlal.s16       q1,  d17,  d21
+-        vld1.16         {d22-d23}, [r1,:128]!
++        vld1.16         {d22-d23}, [r1]!
+         vmlal.s16       q2,  d18,  d22
+         vmlal.s16       q3,  d19,  d23
+         subs            r2,  r2,   #16
diff --git a/prepare_sources.sh b/prepare_sources.sh
index 641dd988f..c9814a328 100755
--- a/prepare_sources.sh
+++ b/prepare_sources.sh
@@ -2,6 +2,14 @@
 
 topdir=`pwd`
 
+cd submodules/externals/ffmpeg
+if test -z "`git status | grep neon`" ; then
+	echo "Applying patch to ffmpeg"
+	cd $topdir
+	patch -p0 < ${topdir}/patches/ffmpeg_scalar_product_remove_alignment_hints.patch
+fi
+cd $topdir
+
 cd submodules/libilbc-rfc3951 && ./autogen.sh && ./configure && make || ( echo "iLBC prepare stage failed" ; exit 1 )
 
 cd $topdir/submodules/externals/build/libvpx && ./asm_conversion.sh && cp *.asm *.h ../../libvpx/ || ( echo "VP8 prepare stage failed." ; exit 1 )