diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index 2b1e486dfc..9982f9b1af 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -1,4 +1,4 @@
-#! /usr/bin/env sh
+#! /usr/bin/env bash
 
 # all.sh
 #
@@ -176,8 +176,8 @@ pre_initialize_variables () {
 
     # Gather the list of available components. These are the functions
     # defined in this script whose name starts with "component_".
-    # Parse the script with sed, because in sh there is no way to list
-    # defined functions.
+    # Parse the script with sed. This way we get the functions in the order
+    # they are defined.
     ALL_COMPONENTS=$(sed -n 's/^ *component_\([0-9A-Z_a-z]*\) *().*/\1/p' <"$0")
 
     # Exclude components that are not supported on this platform.