diff --git a/modules/calcite/pom.xml b/modules/calcite/pom.xml
index 27c49c5b41557..f527c6bee09f4 100644
--- a/modules/calcite/pom.xml
+++ b/modules/calcite/pom.xml
@@ -41,6 +41,7 @@
         <immutables.version>2.8.2</immutables.version>
         <janino.version>3.1.12</janino.version>
         <javacc-maven-plugin>2.4</javacc-maven-plugin>
+        <joou.version>0.9.5</joou.version>
         <jsonpath.version>2.9.0</jsonpath.version>
         <reflections.version>0.10.2</reflections.version>
         <commons.math.version>3.6.1</commons.math.version>
@@ -147,6 +148,16 @@
             <version>${reflections.version}</version>
         </dependency>
 
+        <!--
+            Runtime dependency of calcite-core, declared explicitly: only direct dependencies are copied
+            to target/libs, which both the release package and the exploded test classpath are built from.
+        -->
+        <dependency>
+            <groupId>org.jooq</groupId>
+            <artifactId>joou-java-6</artifactId>
+            <version>${joou.version}</version>
+        </dependency>
+
         <dependency>
             <groupId>org.javassist</groupId>
             <artifactId>javassist</artifactId>