diff --git a/.gitmodules b/.gitmodules
index 2119266b8..1e1d0f7c0 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -54,7 +54,7 @@
 	url = git://git.linphone.org/polarssl.git
 [submodule "submodules/externals/opus"]
 	path = submodules/externals/opus
-	url = http://git.opus-codec.org/opus.git
+	url = git://git.opus-codec.org/opus.git
 [submodule "submodules/externals/libxml2"]
 	path = submodules/externals/libxml2
 	url = git://git.gnome.org/libxml2