diff --git a/charmhelpers/contrib/network/ip.py b/charmhelpers/contrib/network/ip.py
index b5f457c..d6dee17 100644
--- a/charmhelpers/contrib/network/ip.py
+++ b/charmhelpers/contrib/network/ip.py
@@ -414,7 +414,7 @@ def ns_query(address):
     try:
         import dns.resolver
     except ImportError:
-        apt_install('python-dnspython')
+        apt_install('python-dnspython', fatal=True)
         import dns.resolver
 
     if isinstance(address, dns.name.Name):
@@ -458,7 +458,7 @@ def get_hostname(address, fqdn=True):
         try:
             import dns.reversename
         except ImportError:
-            apt_install("python-dnspython")
+            apt_install("python-dnspython", fatal=True)
             import dns.reversename
 
         rev = dns.reversename.from_address(address)
diff --git a/hooks/install b/hooks/install
index 83a9d3c..29ff689 100755
--- a/hooks/install
+++ b/hooks/install
@@ -2,7 +2,7 @@
 # Wrapper to deal with newer Ubuntu versions that don't have py2 installed
 # by default.
 
-declare -a DEPS=('apt' 'netaddr' 'netifaces' 'pip' 'yaml')
+declare -a DEPS=('apt' 'netaddr' 'netifaces' 'pip' 'yaml' 'dnspython')
 
 check_and_install() {
     pkg="${1}-${2}"