diff --git a/cube-src/src/Makefile b/cube-src/src/Makefile
index 10b6056..489483a 100644
--- a/cube-src/src/Makefile
+++ b/cube-src/src/Makefile
@@ -2,7 +2,8 @@ CXX=g++
 CXXOPTFLAGS=-Wall -O3 -fsigned-char -fomit-frame-pointer
 CXXFLAGS=$(CXXOPTFLAGS) -I../enet/include `sdl-config --cflags`
 
-CLIENT_LIBS=-L../enet -lenet `sdl-config --libs` -lSDL_image -lSDL_mixer -lz -lGL -lGLU 
+CLIENT_LIBS=-L../enet -lenet `sdl-config --libs` -lSDL_image -lSDL_mixer -lz -lGL -lGLU \
+	-lX11
 CLIENT_OBJS= \
 	client.o \
 	clientextras.o \