diff --git a/scripts/install_pulseaudio_sources_apt_wrapper.sh b/scripts/install_pulseaudio_sources_apt_wrapper.sh
index 6a32f514..c5b4e1de 100755
--- a/scripts/install_pulseaudio_sources_apt_wrapper.sh
+++ b/scripts/install_pulseaudio_sources_apt_wrapper.sh
@@ -114,6 +114,7 @@ RunWrappedScript()
     schroot="schroot -c pa-build-$USER -d /build"
 
     # Install extra dependencies
+    $schroot -u root -- apt-get update
     $schroot -u root -- apt-get install -y $WRAPPED_SCRIPT_DEPS
 
     # Allow normal user to sudo without a password