diff --git a/build-support/factor.sh b/build-support/factor.sh
index cf6aacb84f..107339eb51 100755
--- a/build-support/factor.sh
+++ b/build-support/factor.sh
@@ -502,7 +502,7 @@ make_boot_image() {
 }
 
 install_build_system_apt() {
-    sudo apt-get --yes install libc6-dev libpango-1.0-dev libx11-dev xorg-dev glutg3-dev wget git-core git-doc rlwrap gcc make
+    sudo apt-get --yes install libc6-dev libpango1.0-dev libx11-dev xorg-dev glutg3-dev wget git-core git-doc rlwrap gcc make
     check_ret sudo
 }