diff --git a/src/main/java/net/fabricmc/loom/LoomGradleExtension.java b/src/main/java/net/fabricmc/loom/LoomGradleExtension.java
index a867380..3fe00fe 100644
--- a/src/main/java/net/fabricmc/loom/LoomGradleExtension.java
+++ b/src/main/java/net/fabricmc/loom/LoomGradleExtension.java
@@ -60,6 +60,7 @@ public class LoomGradleExtension {
 	public boolean extractJars = false;
 	public String customManifest = null;
 	public File accessWidener = null;
+	public Function<String, Object> intermediaryUrl = mcVer -> "https://maven.fabricmc.net/net/fabricmc/intermediary/" + mcVer + "/intermediary-" + mcVer + "-v2.jar";
 
 	private List<Path> unmappedModsBuilt = new ArrayList<>();
 
@@ -317,4 +318,10 @@ public class LoomGradleExtension {
 	public boolean ideSync() {
 		return Boolean.parseBoolean(System.getProperty("idea.sync.active", "false"));
 	}
+
+	// Ideally this should use maven, but this is a lot easier
+	public Function<String, String> getIntermediaryUrl() {
+		//Done like this to work around this possibly not being a java string...
+		return s -> intermediaryUrl.apply(s).toString();
+	}
 }
diff --git a/src/main/java/net/fabricmc/loom/providers/MappingsProvider.java b/src/main/java/net/fabricmc/loom/providers/MappingsProvider.java
index 887f3f7..e466b2c 100644
--- a/src/main/java/net/fabricmc/loom/providers/MappingsProvider.java
+++ b/src/main/java/net/fabricmc/loom/providers/MappingsProvider.java
@@ -151,7 +151,7 @@ public class MappingsProvider extends DependencyProvider {
 
 			// Download and extract intermediary
 			String encodedMinecraftVersion = UrlEscapers.urlFragmentEscaper().escape(minecraftVersion);
-			String intermediaryArtifactUrl = "https://maven.fabricmc.net/net/fabricmc/intermediary/" + encodedMinecraftVersion + "/intermediary-" + encodedMinecraftVersion + "-v2.jar";
+			String intermediaryArtifactUrl = getExtension().getIntermediaryUrl().apply(encodedMinecraftVersion);
 			Path intermediaryJar = mappingsStepsDir.resolve("v2-intermediary-" + minecraftVersion + ".jar");
 			DownloadUtil.downloadIfChanged(new URL(intermediaryArtifactUrl), intermediaryJar.toFile(), project.getLogger());