diff --git a/build-exercise-templates.sh b/build-exercise-templates.sh
index 6f6268bb..e56f4c17 100755
--- a/build-exercise-templates.sh
+++ b/build-exercise-templates.sh
@@ -8,4 +8,5 @@ mkdir exercise-templates
 cargo run --bin exerciser src/exercises/bare-metal/compass.md exercise-templates/compass
 cargo run --bin exerciser src/exercises/bare-metal/rtc.md exercise-templates/rtc
 
+mkdir -p book
 zip --recurse-paths book/exercises.zip exercise-templates/