diff --git a/make.sh b/make.sh
index 53218e3..7818862 100755
--- a/make.sh
+++ b/make.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-FLAGS="-std=c99 -lm"
+FLAGS="-std=c99 -lm -lpthread"
 OUT="out"
 
 if [[ $1 == "build" ]]; then