diff --git a/Makefile b/Makefile
index 27a5a36..0d5ed4a 100644
--- a/Makefile
+++ b/Makefile
@@ -59,7 +59,7 @@ TEST_LOGGER=./src/logger/lib/test/main.c
 LIBS_LOGGER=$(LIB_CORE)
 LIB_LOGGER=-l$(PROJECT_NAME)-logger
 
-LIBS_LIB_CHAT=$(LIB_CORE) -lpthread
+LIBS_LIB_CHAT=$(LIB_CORE) -lpthread -lgmp
 LIB_CHAT=-l$(PROJECT_NAME)-chat
 LIB_CHAT_CONFIG=$(LIB_CHAT)-config
 LIBS_CHAT=$(LIB_CHAT) $(LIBS_LIB_CHAT) $(LIB_CHAT_CONFIG)