diff --git a/releng/org.eclipse.emf.ecoretools.releng.buckminster/releng/ecoretools-build.properties b/releng/org.eclipse.emf.ecoretools.releng.buckminster/releng/ecoretools-build.properties
index fc81f18..474bf62 100644
--- a/releng/org.eclipse.emf.ecoretools.releng.buckminster/releng/ecoretools-build.properties
+++ b/releng/org.eclipse.emf.ecoretools.releng.buckminster/releng/ecoretools-build.properties
@@ -21,4 +21,4 @@
 
 # define the range generation rules for required bundles
 pde.match.rule.default=compatible
-pde.match.rule.retain.lower=true
+pde.match.rule.retain.lower=equivalent