diff --git a/src/Makefile b/src/Makefile
index 3079078..e0007bb 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -1,7 +1,7 @@
 #! /bin/make
 # :vim: set noexpandtab:
 
-CFLAGS = -lm -lSDL2_image `sdl2-config --cflags --libs`
+CFLAGS = -lm -lSDL2_image `sdl2-config --cflags --libs` -lsodium
 
 columns: columns.c
 	$(CC) -o columns columns.c $(CFLAGS)