diff --git a/pika-build-config/i386.sh b/pika-build-config/i386.sh
index 8d23a03..7629d66 100755
--- a/pika-build-config/i386.sh
+++ b/pika-build-config/i386.sh
@@ -1,3 +1,4 @@
+#! /bin/bash
 export PIKA_BUILD_ARCH="i386"
 export DEBIAN_FRONTEND="noninteractive"
 export DEB_BUILD_OPTIONS="nocheck notest terse"