diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index e0cd428..0aa82d1 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,7 +1,7 @@
 image: "ruby:2.1"
 
 before_script:
-  - apt-get update; apt-get install -y check libev-dev net-tools dpkg-dev
+  - apt-get update; apt-get install -y check libev-dev net-tools dpkg-dev libsubunit-dev
 
 unit_test:
   script:
diff --git a/Makefile b/Makefile
index 5626aac..b839419 100644
--- a/Makefile
+++ b/Makefile
@@ -94,7 +94,7 @@ CHECK_OBJ := $(CHECK_SRC:tests/unit/%.c=build/%.o)
 CHECK_BINS := $(CHECK_SRC:tests/unit/%.c=build/%)
 
 build/check_%: build/check_%.o
-	$(LINK) $^ -o $@ $(COMMON_OBJ) $(SERVER_OBJ) -lcheck
+	$(LINK) $^ -o $@ $(COMMON_OBJ) $(SERVER_OBJ) -lcheck -lsubunit
 
 check_objs: $(CHECK_OBJ)