diff --git a/Modules/NetworkSecurityGroups/deploy.json b/Modules/NetworkSecurityGroups/deploy.json
index 5ecf3cf..f1b526c 100644
--- a/Modules/NetworkSecurityGroups/deploy.json
+++ b/Modules/NetworkSecurityGroups/deploy.json
@@ -64,6 +64,7 @@
                                 "priority": "[int(parameters('networkSecurityGroupSecurityRules')[copyIndex('securityRules')].properties.priority)]",
                                 "protocol": "[parameters('networkSecurityGroupSecurityRules')[copyIndex('securityRules')].properties.protocol]",
                                 "sourceAddressPrefix": "[if(equals(parameters('networkSecurityGroupSecurityRules')[copyIndex('securityRules')].properties.sourceAddressPrefix, ''), json('null'), parameters('networkSecurityGroupSecurityRules')[copyIndex('securityRules')].properties.sourceAddressPrefix)]",
+                                "sourceAddressPrefixes": "[if(equals(length(parameters('networkSecurityGroupSecurityRules')[copyIndex('securityRules')].properties.sourceAddressPrefixes), 0), json('null'), parameters('networkSecurityGroupSecurityRules')[copyIndex('securityRules')].properties.sourceAddressPrefixes)]",
                                 "sourceApplicationSecurityGroups": "[if(equals(length(parameters('networkSecurityGroupSecurityRules')[copyIndex('securityRules')].properties.sourceApplicationSecurityGroups), 0), json('null'), concat(variables('emptyArray'), array(json(concat('{\"id\": \"', resourceId('Microsoft.Network/applicationSecurityGroups', parameters('networkSecurityGroupSecurityRules')[copyIndex('securityRules')].properties.sourceApplicationSecurityGroups[0].name), '\"', ',', '\"location\": \"', resourceGroup().location, '\"}')))))]",
                                 "sourcePortRanges": "[if(equals(length(parameters('networkSecurityGroupSecurityRules')[copyIndex('securityRules')].properties.sourcePortRanges), 0), json('null'), parameters('networkSecurityGroupSecurityRules')[copyIndex('securityRules')].properties.sourcePortRanges)]",
                                 "sourcePortRange": "[parameters('networkSecurityGroupSecurityRules')[copyIndex('securityRules')].properties.sourcePortRange]"
@@ -129,4 +130,4 @@
             }
         }
     }
-}
\ No newline at end of file
+}