diff --git a/ChangeLog b/ChangeLog
index 7b38b5c..be4173f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2018-08-03  John Ericson  <john.ericson@obsidian.systems>
+
+	* testsuite/config-guess.sh: Make 'rc' a local variable.
+	* testsuite/config-sub.sh: Likewise.
+
 2018-08-02  John Ericson  <john.ericson@obsidian.systems>
 
 	* testsuite/config-guess.sh: Re-indent with tabs.
diff --git a/testsuite/config-guess.sh b/testsuite/config-guess.sh
index 0648c81..0c0ac18 100644
--- a/testsuite/config-guess.sh
+++ b/testsuite/config-guess.sh
@@ -13,7 +13,7 @@ PATH=$(pwd):$PATH
 
 run_config_guess()
 {
-	rc=0
+	local -i rc=0
 	while IFS='|' read -r machine release system version processor triplet ; do
 		sed \
 			-e "s,@MACHINE@,$machine," \
diff --git a/testsuite/config-sub.sh b/testsuite/config-sub.sh
index 0b1d232..4d01ee0 100644
--- a/testsuite/config-sub.sh
+++ b/testsuite/config-sub.sh
@@ -13,7 +13,7 @@ verbose=false
 
 run_config_sub()
 {
-	rc=0
+	local -i rc=0
 	while read -r alias canonical ; do
 		output=$(sh -eu ../config.sub "$alias")
 		if test "$output" != "$canonical" ; then