diff --git a/build_odin.sh b/build_odin.sh
index 4d2e461dd..f131e088d 100755
--- a/build_odin.sh
+++ b/build_odin.sh
@@ -134,6 +134,14 @@ run_demo() {
 	./odin run examples/demo/demo.odin -file
 }
 
+have_which() {
+	if ! which which > /dev/null 2>&1; then
+		panic "Could not find \`which\`"
+	fi
+}
+
+have_which
+
 case $OS in
 Linux)
 	config_linux