diff --git a/tifoon-plugins/tifoon-nmap-scanner-plugin/src/main/java/com/elixlogic/tifoon/plugin/NmapPortScannerPlugin.java b/tifoon-plugins/tifoon-nmap-scanner-plugin/src/main/java/com/elixlogic/tifoon/plugin/NmapPortScannerPlugin.java
index 9fa629c..e772028 100644
--- a/tifoon-plugins/tifoon-nmap-scanner-plugin/src/main/java/com/elixlogic/tifoon/plugin/NmapPortScannerPlugin.java
+++ b/tifoon-plugins/tifoon-nmap-scanner-plugin/src/main/java/com/elixlogic/tifoon/plugin/NmapPortScannerPlugin.java
@@ -129,7 +129,7 @@ private String[] buildNmapCommandWithArguments(@NonNull final PortScannerJob _re
 
         if (!unsupportedScanTypes.isEmpty()) {
             // warn about running non-root, since these scan types require root access on Unixes
-            log.error("Unsupported scan type(s) specified: {}", unsupportedScanTypes.toString());
+            throw new IllegalArgumentException(String.format("Unsupported scan type(s) specified: %s", unsupportedScanTypes.toString()));
         }
 
         // identify root scan techniques