diff --git a/sdi-plugins/src/main/java/org/gcube/application/cms/sdi/plugins/SDIMaterializerPlugin.java b/sdi-plugins/src/main/java/org/gcube/application/cms/sdi/plugins/SDIMaterializerPlugin.java
index 300cc69..bb9351b 100644
--- a/sdi-plugins/src/main/java/org/gcube/application/cms/sdi/plugins/SDIMaterializerPlugin.java
+++ b/sdi-plugins/src/main/java/org/gcube/application/cms/sdi/plugins/SDIMaterializerPlugin.java
@@ -131,7 +131,11 @@ public class SDIMaterializerPlugin extends AbstractPlugin implements Materializa
                     else requestArguments.putIfAbsent("layerTitle",fs.getUUID());
 
                     //Add FS uuid at ws_baseName
-                    requestArguments.put("workspace",request.getMandatory("workspace")+"_"+ project.getId());
+                    String ws = request.getMandatory("workspace")+"_"+ project.getId();
+                    ws = ws.replaceAll("\\W","_");
+                    log.trace("Escaped WS will be {} ",ws);
+
+                    requestArguments.put("workspace",ws);
 
                     // Actually materializing
                     RegisteredFileSet obtained = getSDIManager().materializeLayer(fs,requestArguments);