diff --git a/msieve/install-root b/msieve/install-root
old mode 100644
new mode 100755
index 961487e..5949ced
--- a/msieve/install-root
+++ b/msieve/install-root
@@ -1,3 +1,3 @@
 #!/bin/bash -e
 
-apt-get -y install libgmp3-dev
+apt-get -y install libgmp3-dev libgmp-dev