diff --git a/src/scripts/location-importer.in b/src/scripts/location-importer.in
index 8d47497..e4a9ab0 100644
--- a/src/scripts/location-importer.in
+++ b/src/scripts/location-importer.in
@@ -1427,18 +1427,21 @@ class CLI(object):
 	def _update_overrides_for_spamhaus_drop(self):
 		downloader = location.importer.Downloader()
 
-		ip_urls = [
-					"https://www.spamhaus.org/drop/drop.txt",
-					"https://www.spamhaus.org/drop/edrop.txt",
-					"https://www.spamhaus.org/drop/dropv6.txt"
+		ip_lists = [
+					("Spamhaus DROP list", "https://www.spamhaus.org/drop/drop.txt"),
+					("Spamhaus EDROP list", "https://www.spamhaus.org/drop/edrop.txt"),
+					("Spamhaus DROPv6 list", "https://www.spamhaus.org/drop/dropv6.txt")
 				]
 
-		asn_urls = [
-					"https://www.spamhaus.org/drop/asndrop.txt"
+		asn_lists = [
+					("Spamhaus ASN-DROP list", "https://www.spamhaus.org/drop/asndrop.txt")
 				]
 
-		for url in ip_urls:
-			# Fetch IP list
+		for list in ip_lists:
+			name = list[0]
+			url = list[1]
+
+			# Fetch IP list from given URL
 			f = downloader.retrieve(url)
 
 			# Split into lines
@@ -1448,11 +1451,11 @@ class CLI(object):
 			# downloads.
 			if len(fcontent) > 10:
 				self.db.execute("""
-					DELETE FROM autnum_overrides WHERE source = 'Spamhaus ASN-DROP list';
-					DELETE FROM network_overrides WHERE source = 'Spamhaus DROP lists';
-				""")
+					DELETE FROM network_overrides WHERE source = '%s';
+				""" % name,
+				)
 			else:
-				log.error("Spamhaus DROP URL %s returned likely bogus file, ignored" % url)
+				log.error("%s (%s) returned likely bogus file, ignored" % (name, url))
 				continue
 
 			# Iterate through every line, filter comments and add remaining networks to
@@ -1475,8 +1478,8 @@ class CLI(object):
 
 					# Sanitize parsed networks...
 					if not self._check_parsed_network(network):
-						log.warning("Skipping bogus network found in Spamhaus DROP URL %s: %s" % \
-							(url, network))
+						log.warning("Skipping bogus network found in %s (%s): %s" % \
+							(name, url, network))
 						continue
 
 					# Conduct SQL statement...
@@ -1488,14 +1491,31 @@ class CLI(object):
 						) VALUES (%s, %s, %s)
 						ON CONFLICT (network) DO UPDATE SET is_drop = True""",
 						"%s" % network,
-						"Spamhaus DROP lists",
+						name,
 						True
 					)
 
-		for url in asn_urls:
+		for list in asn_lists:
+			name = list[0]
+			url = list[1]
+
 			# Fetch URL
 			f = downloader.retrieve(url)
 
+			# Split into lines
+			fcontent = f.readlines()
+
+			# Conduct a very basic sanity check to rule out CDN issues causing bogus DROP
+			# downloads.
+			if len(fcontent) > 10:
+				self.db.execute("""
+					DELETE FROM autnum_overrides WHERE source = '%s';
+				""" % name,
+				)
+			else:
+				log.error("%s (%s) returned likely bogus file, ignored" % (name, url))
+				continue
+
 			# Iterate through every line, filter comments and add remaining ASNs to
 			# the override table in case they are valid...
 			with self.db.transaction():
@@ -1518,8 +1538,8 @@ class CLI(object):
 
 					# Filter invalid ASNs...
 					if not self._check_parsed_asn(asn):
-						log.warning("Skipping bogus ASN found in Spamhaus DROP URL %s: %s" % \
-							(url, asn))
+						log.warning("Skipping bogus ASN found in %s (%s): %s" % \
+							(name, url, asn))
 						continue
 
 					# Conduct SQL statement...
@@ -1531,7 +1551,7 @@ class CLI(object):
 						) VALUES (%s, %s, %s)
 						ON CONFLICT (number) DO UPDATE SET is_drop = True""",
 						"%s" % asn,
-						"Spamhaus ASN-DROP list",
+						name,
 						True
 					)