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diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/environment/filter/NegativeNamespaceFilter.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/environment/filter/NegativeNamespaceFilter.java
new file mode 100644
index 000000000..a0203d2d0
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/environment/filter/NegativeNamespaceFilter.java
@@ -0,0 +1,35 @@
+package org.simantics.scl.compiler.environment.filter;
+
+import gnu.trove.set.hash.THashSet;
+
+public class NegativeNamespaceFilter implements NamespaceFilter {
+    THashSet<String> excludedValues;
+
+    public NegativeNamespaceFilter(THashSet<String> excludedValues) {
+        this.excludedValues = excludedValues;
+    }
+
+    @Override
+    public boolean isValueIncluded(String name) {
+        return !excludedValues.contains(name);
+    }
+    
+    @Override
+    public String toString() {
+        return "Exclude" + excludedValues.toString();
+    }
+
+    @Override
+    public boolean isSubsetOf(NamespaceFilter filter) {
+        if(filter == AcceptAllNamespaceFilter.INSTANCE)
+            return true;
+        if(filter instanceof NegativeNamespaceFilter) {
+            NegativeNamespaceFilter other = (NegativeNamespaceFilter)filter;
+            for(String name : other.excludedValues)
+                if(!excludedValues.contains(name))
+                    return false;
+            return true;
+        }
+        return false;
+    }
+}