diff --git a/tycho-bundles/org.eclipse.tycho.p2.resolver.impl/src/main/java/org/eclipse/tycho/p2/target/ee/AllKnownEEsResolutionHints.java b/tycho-bundles/org.eclipse.tycho.p2.resolver.impl/src/main/java/org/eclipse/tycho/p2/target/ee/AllKnownEEsResolutionHints.java
index a8411f21ce..bdc801d501 100644
--- a/tycho-bundles/org.eclipse.tycho.p2.resolver.impl/src/main/java/org/eclipse/tycho/p2/target/ee/AllKnownEEsResolutionHints.java
+++ b/tycho-bundles/org.eclipse.tycho.p2.resolver.impl/src/main/java/org/eclipse/tycho/p2/target/ee/AllKnownEEsResolutionHints.java
@@ -16,6 +16,7 @@
 import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
+import java.util.Objects;
 
 import org.eclipse.equinox.p2.metadata.IInstallableUnit;
 import org.eclipse.equinox.p2.metadata.IRequirement;
@@ -62,4 +63,21 @@ public Collection<IInstallableUnit> getTemporaryAdditions() {
         return temporaryUnits.values();
     }
 
+    @Override
+    public int hashCode() {
+        return Objects.hash(temporaryUnits);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (getClass() != obj.getClass())
+            return false;
+        AllKnownEEsResolutionHints other = (AllKnownEEsResolutionHints) obj;
+        return Objects.equals(temporaryUnits, other.temporaryUnits);
+    }
+
 }