diff --git a/prepare_sources.sh b/prepare_sources.sh
index 4985eb10c..22b4c76b7 100755
--- a/prepare_sources.sh
+++ b/prepare_sources.sh
@@ -13,7 +13,7 @@ cd $topdir/submodules/libilbc-rfc3951 && ./autogen.sh && ./configure && make ||
 
 cd $topdir/submodules/externals/build/libvpx && ./asm_conversion.sh && cp *.asm *.h ../../libvpx/ || ( echo "VP8 prepare stage failed." ; exit 1 )
 
-cd $topdir/submodules/mssilk && ./autogen.sh && ./configure && make extract-sources || ( echo "SILK audio plugin prepare state failed." ; exit 1 )
+cd $topdir/submodules/mssilk && ./autogen.sh && ./configure && cd sdk && make extract-sources || ( echo "SILK audio plugin prepare state failed." ; exit 1 )
 
 
 # As a memo, the config.h for zrtpcpp is generated using the command