diff --git a/frontend-plugin-core/src/main/java/com/github/eirslett/maven/plugins/frontend/lib/NpxRunner.java b/frontend-plugin-core/src/main/java/com/github/eirslett/maven/plugins/frontend/lib/NpxRunner.java
index fb7c0b3e..b4f4db1d 100644
--- a/frontend-plugin-core/src/main/java/com/github/eirslett/maven/plugins/frontend/lib/NpxRunner.java
+++ b/frontend-plugin-core/src/main/java/com/github/eirslett/maven/plugins/frontend/lib/NpxRunner.java
@@ -11,11 +11,18 @@ final class DefaultNpxRunner extends NodeTaskExecutor implements NpxRunner {
     static final String TASK_NAME = "npx";
 
     public DefaultNpxRunner(NodeExecutorConfig config, ProxyConfig proxyConfig, String npmRegistryURL) {
-        super(config, TASK_NAME, config.getNpxPath().getAbsolutePath(), buildArguments(proxyConfig, npmRegistryURL));
+        super(config, TASK_NAME, config.getNpxPath().getAbsolutePath(), buildNpmArguments(proxyConfig, npmRegistryURL));
     }
 
-    private static List<String> buildArguments(ProxyConfig proxyConfig, String npmRegistryURL) {
-        List<String> arguments = new ArrayList<String>();
+    // Visible for testing only.
+    /**
+     * These are, in fact, npm arguments, that need to be split from the npx arguments by '--'.
+     *
+     * See an example:
+     * npx some-package -- --registry=http://myspecialregisty.com
+     */
+    static List<String> buildNpmArguments(ProxyConfig proxyConfig, String npmRegistryURL) {
+        List<String> arguments = new ArrayList<>();
                
         if(npmRegistryURL != null && !npmRegistryURL.isEmpty()){
             arguments.add ("--registry=" + npmRegistryURL);
@@ -38,7 +45,16 @@ private static List<String> buildArguments(ProxyConfig proxyConfig, String npmRe
             arguments.add("--https-proxy=" + proxy.getUri().toString());
             arguments.add("--proxy=" + proxy.getUri().toString());
         }
+
+        List<String> npmArguments;
+        if (arguments.isEmpty()) {
+            npmArguments = arguments;
+        } else {
+            npmArguments = new ArrayList<>();
+            npmArguments.add("--");
+            npmArguments.addAll(arguments);
+        }
         
-        return arguments;
+        return npmArguments;
     }
 }
diff --git a/frontend-plugin-core/src/test/java/com/github/eirslett/maven/plugins/frontend/lib/DefaultNpxRunnerTest.java b/frontend-plugin-core/src/test/java/com/github/eirslett/maven/plugins/frontend/lib/DefaultNpxRunnerTest.java
new file mode 100644
index 00000000..6d5449c1
--- /dev/null
+++ b/frontend-plugin-core/src/test/java/com/github/eirslett/maven/plugins/frontend/lib/DefaultNpxRunnerTest.java
@@ -0,0 +1,28 @@
+package com.github.eirslett.maven.plugins.frontend.lib;
+
+import static org.junit.Assert.assertThat;
+
+import java.util.Collections;
+import java.util.List;
+
+import org.hamcrest.CoreMatchers;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class DefaultNpxRunnerTest {
+
+    private final String registryUrl = "www.npm.org";
+
+    @Test
+    public void buildArgument_basicTest() {
+        List<String> arguments = DefaultNpxRunner.buildNpmArguments(new ProxyConfig(Collections.emptyList()), null);
+        Assert.assertEquals(0, arguments.size());
+    }
+
+    @Test
+    public void buildArgument_withRegistryUrl() {
+        List<String> arguments = DefaultNpxRunner.buildNpmArguments(new ProxyConfig(Collections.emptyList()), registryUrl);
+        Assert.assertEquals(2, arguments.size());
+        assertThat(arguments, CoreMatchers.hasItems("--", "--registry=" + registryUrl));
+    }
+}