diff --git a/prepare_sources.sh b/prepare_sources.sh
index 1123f9002..61c67aee5 100755
--- a/prepare_sources.sh
+++ b/prepare_sources.sh
@@ -2,7 +2,7 @@
 
 topdir=`pwd`
 
-cd submodules/libilbc-rfc3951 && ./configure && make || ( echo "iLBC prepare stage failed" ; exit -1 )
+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 )
 
diff --git a/submodules/libilbc-rfc3951 b/submodules/libilbc-rfc3951
index 6ad2de508..5b6ac8974 160000
--- a/submodules/libilbc-rfc3951
+++ b/submodules/libilbc-rfc3951
@@ -1 +1 @@
-Subproject commit 6ad2de508b823b022ca3c3443b8ce6223d764c93
+Subproject commit 5b6ac8974d1a5f8059b964b329c565d4afe06358