diff --git a/src/main/java/net/fabricmc/loom/configuration/providers/minecraft/MinecraftSourceSets.java b/src/main/java/net/fabricmc/loom/configuration/providers/minecraft/MinecraftSourceSets.java
index 1893703a..700b9b74 100644
--- a/src/main/java/net/fabricmc/loom/configuration/providers/minecraft/MinecraftSourceSets.java
+++ b/src/main/java/net/fabricmc/loom/configuration/providers/minecraft/MinecraftSourceSets.java
@@ -209,13 +209,15 @@ public abstract sealed class MinecraftSourceSets permits MinecraftSourceSets.Sin
 				);
 			});
 
-			if (project.getTasks().findByName(mainSourceSet.getSourcesJarTaskName()) == null) {
-				// No sources.
-				return;
-			}
+			// The sources task can be registered at a later time.
+			project.getTasks().withType(Jar.class, sources -> {
+				if (!mainSourceSet.getSourcesJarTaskName().equals(sources.getName())) {
+					// Not the sources task we are looking for.
+					return;
+				}
 
-			project.getTasks().named(mainSourceSet.getSourcesJarTaskName(), Jar.class).configure(jar -> {
-				jar.from(clientOnlySourceSet.getAllSource());
+				// The client only sources to the combined sources jar.
+				sources.from(clientOnlySourceSet.getAllSource());
 			});
 		}