diff --git a/src/main/java/ru/octol1ttle/knockdowns/client/gui/KnockedNotificationGui.java b/src/main/java/ru/octol1ttle/knockdowns/client/gui/KnockedNotificationGui.java
index c8055fb..cfa468c 100644
--- a/src/main/java/ru/octol1ttle/knockdowns/client/gui/KnockedNotificationGui.java
+++ b/src/main/java/ru/octol1ttle/knockdowns/client/gui/KnockedNotificationGui.java
@@ -7,11 +7,14 @@ import net.minecraft.entity.Entity;
 import net.minecraft.util.ResourceLocation;
 import net.minecraft.util.math.MathHelper;
 import net.minecraft.util.math.Vec3d;
+import net.minecraftforge.fml.relauncher.Side;
+import net.minecraftforge.fml.relauncher.SideOnly;
 import org.lwjgl.opengl.GL11;
 import ru.octol1ttle.knockdowns.Tags;
 import ru.octol1ttle.knockdowns.client.communication.KnockedNotificationManager;
 import ru.octol1ttle.knockdowns.client.util.KnockedPlayerData;
 
+@SideOnly(Side.CLIENT)
 public class KnockedNotificationGui extends KnockdownsBaseGui {
     private static final Minecraft client = Minecraft.getMinecraft();
     private static final int KNOCKED_ICON_SIZE = 18;
diff --git a/src/main/java/ru/octol1ttle/knockdowns/client/gui/ReviveGui.java b/src/main/java/ru/octol1ttle/knockdowns/client/gui/ReviveGui.java
index ad78dbb..02816fd 100644
--- a/src/main/java/ru/octol1ttle/knockdowns/client/gui/ReviveGui.java
+++ b/src/main/java/ru/octol1ttle/knockdowns/client/gui/ReviveGui.java
@@ -5,9 +5,12 @@ import net.minecraft.client.gui.FontRenderer;
 import net.minecraft.client.gui.ScaledResolution;
 import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.util.text.TextFormatting;
+import net.minecraftforge.fml.relauncher.Side;
+import net.minecraftforge.fml.relauncher.SideOnly;
 import ru.octol1ttle.knockdowns.common.KnockdownsUtils;
 import ru.octol1ttle.knockdowns.common.data.IKnockdownsPlayerData;
 
+@SideOnly(Side.CLIENT)
 public class ReviveGui extends KnockdownsBaseGui {
     private static final Minecraft client = Minecraft.getMinecraft();
 
diff --git a/src/main/java/ru/octol1ttle/knockdowns/client/util/KnockedPlayerData.java b/src/main/java/ru/octol1ttle/knockdowns/client/util/KnockedPlayerData.java
index 8cebdde..34884c9 100644
--- a/src/main/java/ru/octol1ttle/knockdowns/client/util/KnockedPlayerData.java
+++ b/src/main/java/ru/octol1ttle/knockdowns/client/util/KnockedPlayerData.java
@@ -1,7 +1,10 @@
 package ru.octol1ttle.knockdowns.client.util;
 
 import net.minecraft.util.math.Vec3d;
+import net.minecraftforge.fml.relauncher.Side;
+import net.minecraftforge.fml.relauncher.SideOnly;
 
+@SideOnly(Side.CLIENT)
 public class KnockedPlayerData {
     private final int playerId;
     private final Vec3d position;