diff --git a/test/bochs.sh b/test/bochs.sh
index 9ddebcd..cfbcb27 100755
--- a/test/bochs.sh
+++ b/test/bochs.sh
@@ -3,6 +3,7 @@ set -e
 
 if test $# -ne 1 || test "$1" = '-h' -o "$1" = '--help'; then
     echo "Usage: $0 operating_system_file"
+    exit 1
 fi
 os_filename="$1"
 
diff --git a/test/dosbox.sh b/test/dosbox.sh
index 9f5571d..767802d 100755
--- a/test/dosbox.sh
+++ b/test/dosbox.sh
@@ -3,6 +3,7 @@ set -e
 
 if test $# -ne 1 || test "$1" = '-h' -o "$1" = '--help'; then
     echo "Usage: $0 operating_system_file"
+    exit 1
 fi
 os_filename="$1"
 
diff --git a/test/gui-sh-mac.sh b/test/gui-sh-mac.sh
index 7659996..e9f12b8 100755
--- a/test/gui-sh-mac.sh
+++ b/test/gui-sh-mac.sh
@@ -3,6 +3,7 @@ set -e
 
 if test $# -ne 1 || test "$1" = '-h' -o "$1" = '--help'; then
     echo "Usage: $0 operating_system_file"
+    exit 1
 fi
 # Force the path to be relative or absolute, but with at least one /
 # Otherwise, the command will be searched in the $PATH, instead of using the
diff --git a/test/gui-sh.sh b/test/gui-sh.sh
index 8326c52..5fc2480 100755
--- a/test/gui-sh.sh
+++ b/test/gui-sh.sh
@@ -3,6 +3,7 @@ set -e
 
 if test $# -ne 1 || test "$1" = '-h' -o "$1" = '--help'; then
     echo "Usage: $0 operating_system_file"
+    exit 1
 fi
 # Force the path to be relative or absolute, but with at least one /
 # Otherwise, the command will be searched in the $PATH, instead of using the
diff --git a/test/qemu-system-i386-cdrom.sh b/test/qemu-system-i386-cdrom.sh
index 0ac9ea4..e412b87 100755
--- a/test/qemu-system-i386-cdrom.sh
+++ b/test/qemu-system-i386-cdrom.sh
@@ -3,6 +3,7 @@ set -e
 
 if test $# -ne 1 || test "$1" = '-h' -o "$1" = '--help'; then
     echo "Usage: $0 operating_system_file"
+    exit 1
 fi
 os_filename="$1"
 
diff --git a/test/qemu-system-i386-floppy.sh b/test/qemu-system-i386-floppy.sh
index 9b0e7b6..fd57cdf 100755
--- a/test/qemu-system-i386-floppy.sh
+++ b/test/qemu-system-i386-floppy.sh
@@ -3,6 +3,7 @@ set -e
 
 if test $# -ne 1 || test "$1" = '-h' -o "$1" = '--help'; then
     echo "Usage: $0 operating_system_file"
+    exit 1
 fi
 os_filename="$1"
 
diff --git a/test/virtualbox.sh b/test/virtualbox.sh
index db152f8..73f6020 100755
--- a/test/virtualbox.sh
+++ b/test/virtualbox.sh
@@ -3,6 +3,7 @@ set -e
 
 if test $# -ne 1 || test "$1" = '-h' -o "$1" = '--help'; then
     echo "Usage: $0 operating_system_file"
+    exit 1
 fi
 os_filename="$1"