diff --git a/bin/pt-pmp b/bin/pt-pmp
index bab0dc24..d4164f06 100755
--- a/bin/pt-pmp
+++ b/bin/pt-pmp
@@ -4,6 +4,8 @@
 # See "COPYRIGHT, LICENSE, AND WARRANTY" at the end of this file for legal
 # notices and disclaimers.
 
+TOOL="pt-pmp"
+
 # ###########################################################################
 # tmpdir package
 # This package is a copy without comments from the original.  The original
@@ -212,7 +214,8 @@ main() {
 
 # Execute the program if it was not included from another file.  This makes it
 # possible to include without executing, and thus test.
-if [ "$(basename "$0")" = "pt-pmp" ] || [ "$(basename "$0")" = "bash" -a "$_" = "$0" ]; then
+if    [ "${0##*/}" = "$TOOL" ] \
+   || [ "${0##*/}" = "bash" -a "$_" = "$0" ]; then
    mk_tmpdir
    main "$@"
    rm_tmpdir
diff --git a/bin/pt-sift b/bin/pt-sift
index cc29b3d9..c0615821 100755
--- a/bin/pt-sift
+++ b/bin/pt-sift
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+TOOL="pt-sift"
+
 # This program is part of Percona Toolkit: http://www.percona.com/software/
 # See "COPYRIGHT, LICENSE, AND WARRANTY" at the end of this file for legal
 # notices and disclaimers.
@@ -536,7 +538,8 @@ main() {
 
 # Execute the program if it was not included from another file.  This makes it
 # possible to include without executing, and thus test.
-if [ "$(basename "$0")" = "pt-sift" ] || [ "$(basename "$0")" = "bash" -a "$_" = "$0" ]; then
+if    [ "${0##*/}" = "$TOOL" ] \
+   || [ "${0##*/}" = "bash" -a "$_" = "$0" ]; then
     main "$@"
 fi