diff --git a/bootstrap.sh b/bootstrap.sh
index 8780bc3..9b9a839 100755
--- a/bootstrap.sh
+++ b/bootstrap.sh
@@ -1,6 +1,7 @@
 #! /bin/bash
 
 echo "TTRTS: Running cmake"
+test ! -e build && mkdir build
 cd build/
 cmake ../source
 if [[ $? != 0 ]]; then