diff --git a/src/main/java/net/fabricmc/loom/task/GenIdeaProjectTask.java b/src/main/java/net/fabricmc/loom/task/GenIdeaProjectTask.java
index cd2742a..2521bf3 100644
--- a/src/main/java/net/fabricmc/loom/task/GenIdeaProjectTask.java
+++ b/src/main/java/net/fabricmc/loom/task/GenIdeaProjectTask.java
@@ -140,7 +140,7 @@ public class GenIdeaProjectTask extends DefaultTask {
 		ideaClient.configName = "Minecraft Client";
 		ideaClient.runDir = "file://$PROJECT_DIR$/" + extension.runDir;
 		ideaClient.vmArgs = "-Djava.library.path=" + Constants.MINECRAFT_NATIVES.get(extension).getAbsolutePath() + " -Dfabric.development=true";
-		ideaClient.programArgs = "--tweakClass com.openmodloader.loader.launch.OpenClientTweaker --tweakClass org.spongepowered.asm.launch.MixinTweaker --assetIndex " + version.assetIndex.id + " --assetsDir " + new File(extension.getUserCache(), "assets-" + extension.version).getAbsolutePath();
+		ideaClient.programArgs = "--tweakClass com.openmodloader.loader.launch.OpenClientTweaker --assetIndex " + version.assetIndex.id + " --assetsDir " + new File(extension.getUserCache(), "assets-" + extension.version).getAbsolutePath();
 
 		runManager.appendChild(ideaClient.genRuns(runManager));
 
@@ -150,7 +150,7 @@ public class GenIdeaProjectTask extends DefaultTask {
 		ideaServer.configName = "Minecraft Server";
 		ideaServer.runDir = "file://$PROJECT_DIR$/" + extension.runDir;
 		ideaServer.vmArgs = "-Dfabric.development=true";
-		ideaServer.programArgs = "--tweakClass com.openmodloader.loader.launch.OpenServerTweaker --tweakClass org.spongepowered.asm.launch.MixinTweaker";
+		ideaServer.programArgs = "--tweakClass com.openmodloader.loader.launch.OpenServerTweaker";
 
 		runManager.appendChild(ideaServer.genRuns(runManager));
 
diff --git a/src/main/java/net/fabricmc/loom/task/RunClientTask.java b/src/main/java/net/fabricmc/loom/task/RunClientTask.java
index 02e4e17..aaa5795 100644
--- a/src/main/java/net/fabricmc/loom/task/RunClientTask.java
+++ b/src/main/java/net/fabricmc/loom/task/RunClientTask.java
@@ -65,10 +65,10 @@ public class RunClientTask extends JavaExec {
 				libs.add(file.getAbsolutePath());
 			}
 		}
-		libs.add(Constants.MINECRAFT_FINAL_JAR.get(extension).getAbsolutePath());
+		libs.add(Constants.MINECRAFT_CLIENT_JAR.get(extension).getAbsolutePath());
 		classpath(libs);
 
-		args("--tweakClass", "com.openmodloader.loader.launch.OpenClientTweaker", "--tweakClass", "org.spongepowered.asm.launch.MixinTweaker", "--assetIndex", version.assetIndex.id, "--assetsDir", new File(extension.getUserCache(), "assets-" + extension.version).getAbsolutePath());
+		args("--tweakClass", "com.openmodloader.loader.launch.OpenClientTweaker", "--assetIndex", version.assetIndex.id, "--assetsDir", new File(extension.getUserCache(), "assets-" + extension.version).getAbsolutePath());
 
 		setWorkingDir(new File(getProject().getRootDir(), "run"));
 
@@ -85,7 +85,6 @@ public class RunClientTask extends JavaExec {
 		LoomGradleExtension extension = this.getProject().getExtensions().getByType(LoomGradleExtension.class);
 		List<String> args = new ArrayList<>();
 		args.add("-Djava.library.path=" + Constants.MINECRAFT_NATIVES.get(extension).getAbsolutePath());
-		args.add("-Dfabric.development=true");
 		args.add("-XstartOnFirstThread"); //Fixes lwjgl starting on an incorrect thread
 		return args;
 	}
diff --git a/src/main/java/net/fabricmc/loom/task/RunServerTask.java b/src/main/java/net/fabricmc/loom/task/RunServerTask.java
index bd76d0c..115a5f4 100644
--- a/src/main/java/net/fabricmc/loom/task/RunServerTask.java
+++ b/src/main/java/net/fabricmc/loom/task/RunServerTask.java
@@ -66,7 +66,6 @@ public class RunServerTask extends JavaExec {
 		classpath(libs);
 
 		args("--tweakClass", "com.openmodloader.loader.launch.OpenServerTweaker");
-		args("--tweakClass", "org.spongepowered.asm.launch.MixinTweaker");
 
 		setWorkingDir(new File(getProject().getRootDir(), "run"));