diff --git a/test.sh b/test.sh
index 5814a47..7b92e56 100755
--- a/test.sh
+++ b/test.sh
@@ -1,9 +1,11 @@
+#!/bin/bash
+
 # Starting with Racket 7.4, there is also a "CS" flavor.
 for VER in 7.5 7.4 ; do
     for MIN in 0 1; do
         for NAT in 0 1; do
             for CS in 0 1; do
-                TEST=1 RACKET_MINIMAL=$MIN RACKET_NATIPKG=$NAT RACKET_CS=$CS RACKET_VERSION=$VER ./install-racket.sh
+                TEST=1 RACKET_MINIMAL=$MIN RACKET_NATIPKG=$NAT RACKET_CS=$CS RACKET_VERSION=$VER ./install-racket.sh || exit 1
             done
         done
     done
@@ -13,7 +15,7 @@ done
 for VER in 7.3 7.2 7.1 7.0 6.12 6.11 6.10 6.9 6.8 6.7 6.6 6.5 ; do
     for MIN in 0 1; do
         for NAT in 0 1; do
-            TEST=1 RACKET_MINIMAL=$MIN RACKET_NATIPKG=$NAT RACKET_VERSION=$VER ./install-racket.sh
+            TEST=1 RACKET_MINIMAL=$MIN RACKET_NATIPKG=$NAT RACKET_VERSION=$VER ./install-racket.sh || exit 1
         done
     done
 done
@@ -21,6 +23,6 @@ done
 # In older Racket versions, there is a "MINIMAL" "flavor".
 for VER in HEAD HEADCS RELEASE RELEASECS 6.4 6.3 6.2 6.2.1 6.1 6.1.1 6.0 6.0.1 5.93 5.92 5.3 5.3.6 5.3.5 5.3.4 5.3.3 5.3.2 5.3.1 ; do
     for MIN in 0 1; do
-        TEST=1 RACKET_MINIMAL=$MIN RACKET_VERSION=$VER ./install-racket.sh
+        TEST=1 RACKET_MINIMAL=$MIN RACKET_VERSION=$VER ./install-racket.sh || exit 1
     done
 done