diff --git a/rdf-processing-toolkit-cli/src/main/java/org/aksw/sparql_integrate/cli/cmd/CmdSparqlIntegrateMain.java b/rdf-processing-toolkit-cli/src/main/java/org/aksw/sparql_integrate/cli/cmd/CmdSparqlIntegrateMain.java
index 274bb94..c67adfc 100644
--- a/rdf-processing-toolkit-cli/src/main/java/org/aksw/sparql_integrate/cli/cmd/CmdSparqlIntegrateMain.java
+++ b/rdf-processing-toolkit-cli/src/main/java/org/aksw/sparql_integrate/cli/cmd/CmdSparqlIntegrateMain.java
@@ -12,6 +12,7 @@
 
 import org.aksw.jenax.arq.picocli.CmdMixinArq;
 import org.aksw.jenax.arq.picocli.CmdMixinSparqlPaginate;
+import org.aksw.jenax.dataaccess.sparql.polyfill.datasource.RdfDataSourceWithLocalLateral.PolyfillLateralConfig;
 import org.aksw.rdf_processing_toolkit.cli.cmd.CmdCommonBase;
 import org.aksw.rdf_processing_toolkit.cli.cmd.VersionProviderRdfProcessingToolkit;
 import org.aksw.sparql_integrate.cli.main.SparqlIntegrateCmdImpls;
@@ -21,6 +22,7 @@
 import picocli.CommandLine.ArgGroup;
 import picocli.CommandLine.Command;
 import picocli.CommandLine.IParameterConsumer;
+import picocli.CommandLine.ITypeConverter;
 import picocli.CommandLine.Mixin;
 import picocli.CommandLine.Model.ArgSpec;
 import picocli.CommandLine.Model.CommandSpec;
@@ -206,8 +208,18 @@ public static class OutputSpec {
             negatable = true, defaultValue = "true", fallbackValue = "true")
     public boolean graphQlAutoConfigure;
 
-    @Option(names = { "--polyfill-lateral" }, description = "Polyfill LATERAL by evaluating it on the client (may transmit large volumes of data).")
-    public boolean polyfillLateral;
+    @Option(names = { "--polyfill-lateral" },
+            description = "Polyfill LATERAL by evaluating it on the client (may transmit large volumes of data). Format: [{bulkSize}[-{concurrentThreadCount}]]",
+            converter = TypeConverterPolyfillLateralConfig.class,
+            fallbackValue = "10-0")
+    public PolyfillLateralConfig polyfillLateral = null;
+
+    public static class TypeConverterPolyfillLateralConfig implements ITypeConverter<PolyfillLateralConfig> {
+        @Override
+        public PolyfillLateralConfig convert(String s) {
+            return PolyfillLateralConfig.parse(s);
+        }
+    }
 
     /**
      * --jq may be followed by an integer - picocli seems to greedily parse any argument even if it is not an integer
diff --git a/rdf-processing-toolkit-cli/src/main/java/org/aksw/sparql_integrate/cli/main/SparqlIntegrateCmdImpls.java b/rdf-processing-toolkit-cli/src/main/java/org/aksw/sparql_integrate/cli/main/SparqlIntegrateCmdImpls.java
index 956ee35..5cb675c 100644
--- a/rdf-processing-toolkit-cli/src/main/java/org/aksw/sparql_integrate/cli/main/SparqlIntegrateCmdImpls.java
+++ b/rdf-processing-toolkit-cli/src/main/java/org/aksw/sparql_integrate/cli/main/SparqlIntegrateCmdImpls.java
@@ -137,9 +137,7 @@ public class SparqlIntegrateCmdImpls {
     private static final Logger logger = LoggerFactory.getLogger(SparqlIntegrateCmdImpls.class);
 
     public static RdfDataEngine setupRdfDataEngine(CmdSparqlIntegrateMain cmd) throws Exception {
-
         String sourceType = Optional.ofNullable(cmd.engine).orElse("mem");
-
         RdfDataEngineFactory factory = RdfDataEngineFactoryRegistry.get().getFactory(sourceType);
         if (factory == null) {
             throw new RuntimeException("No RdfDataSourceFactory registered under name " + sourceType);
@@ -803,8 +801,8 @@ public void afterExec() {
                 dataSource = RdfDataSources.execQueryViaSelect(dataSource, query -> query.isConstructQuad());
             }
 
-            if (cmd.polyfillLateral) {
-                dataSource = RdfDataSourceWithLocalLateral.wrap(dataSource);
+            if (cmd.polyfillLateral != null) {
+                dataSource = RdfDataSourceWithLocalLateral.wrap(dataSource, cmd.polyfillLateral);
             }
 
             RdfDataSource finalDataSource = dataSource;