diff --git a/versions/1.21.4/src/main/java/org/saturnclient/saturnclient/mixin/MatrixStackMixin.java b/versions/1.21.4/src/main/java/org/saturnclient/saturnclient/mixin/MatrixStackMixin.java
new file mode 100644
index 0000000..95aa5d1
--- /dev/null
+++ b/versions/1.21.4/src/main/java/org/saturnclient/saturnclient/mixin/MatrixStackMixin.java
@@ -0,0 +1,21 @@
+package org.saturnclient.saturnclient.mixin;
+
+import org.joml.Quaternionf;
+import org.saturnclient.common.minecraft.bindings.SaturnQuaternionf;
+import org.saturnclient.common.minecraft.render.IMatrixStack;
+import org.spongepowered.asm.mixin.Mixin;
+
+import net.minecraft.client.util.math.MatrixStack;
+
+@Mixin(MatrixStack.class)
+public class MatrixStackMixin extends MatrixStack implements IMatrixStack {
+    @Override
+    public void multiply(SaturnQuaternionf quaternion) {
+        this.multiply((Quaternionf) quaternion.inner);
+    }
+
+    @Override
+    public void multiply(SaturnQuaternionf quaternion, float originX, float originY, float originZ) {
+        this.multiply((Quaternionf) quaternion.inner, originX, originY, originZ);
+    }
+}
diff --git a/versions/1.21.4/src/main/resources/saturnclient.mixins.json b/versions/1.21.4/src/main/resources/saturnclient.mixins.json
index b7aa28a..2f07804 100644
--- a/versions/1.21.4/src/main/resources/saturnclient.mixins.json
+++ b/versions/1.21.4/src/main/resources/saturnclient.mixins.json
@@ -11,7 +11,8 @@
     "DrawContextAccessor",
     "SplashOverlayMixin",
     "SetScreenMixin",
-    "MinecraftClientMixin"
+    "MinecraftClientMixin",
+    "MatrixStackMixin"
   ],
   "injectors": {
     "defaultRequire": 1