diff --git a/makefile b/makefile
index 5580a57..8e26d2f 100644
--- a/makefile
+++ b/makefile
@@ -2,7 +2,7 @@ NUMCORES = $(shell grep -c "^processor" /proc/cpuinfo)
 NUMCORESWIN = ${NUMBER_OF_PROCESSORS}
 TESTFLAGS = -O2 -std=c++20 -Wall -fcoroutines
 LINKEDLIBS = -lgmp -lgmpxx
-INCLUDE_DIR = ./headers/mee
+INCLUDE_DIR = ../../headers
 TESTDIR = ./test/mee
 BINDIR = ./bin
 LOGDIR = ./logs
diff --git a/test/mee/testVectorAlgorithms.cpp b/test/mee/testVectorAlgorithms.cpp
index 799188d..77cebc7 100644
--- a/test/mee/testVectorAlgorithms.cpp
+++ b/test/mee/testVectorAlgorithms.cpp
@@ -23,6 +23,7 @@
 
 #include <cinttypes>
 #include <iostream>
+#include <numeric>
 #include <random>
 #include <vector>
 #include "mee/numberAlgorithms.hpp"