diff --git a/ivy.xml b/ivy.xml
index eb44764..0164861 100644
--- a/ivy.xml
+++ b/ivy.xml
@@ -10,6 +10,7 @@
         <dependency org="org.jocl" name="jocl" rev="0.1.9"/>
         <dependency org="org.slf4j" name="slf4j-api" rev="1.6.6" conf="default->master"/>
         <dependency org="org.perf4j" name="perf4j" rev="0.9.16" conf="default->master"/>
+        <dependency org="ch.qos.logback" name="logback-core" rev="1.0.7" conf="default->master"/>
         <dependency org="ch.qos.logback" name="logback-classic" rev="1.0.7" conf="default->master"/>
         <dependency org="net.sf.jopt-simple" name="jopt-simple" rev="4.3" conf="default->master"/>
         <dependency org="it.unimi.dsi" name="fastutil" rev="6.5.15"/>