diff --git a/bin/python/isc/coverage.py.in b/bin/python/isc/coverage.py.in
index b6ed5d0a69..14c00aac0a 100644
--- a/bin/python/isc/coverage.py.in
+++ b/bin/python/isc/coverage.py.in
@@ -189,7 +189,8 @@ def parse_args():
         fatal("ERROR: -f can only be used with one zone.")
 
     # strip trailing dots
-    args.zone = [x[:-1] for x in args.zone if len(x) > 1 and x[-1] == '.']
+    args.zone = [x[:-1] if len(x) > 1 and x[-1] == '.' else x
+                 for x in args.zone]
 
     # convert from time arguments to seconds
     try:
diff --git a/bin/tests/system/coverage/clean.sh b/bin/tests/system/coverage/clean.sh
index 253e8aaca5..9917e2e24f 100644
--- a/bin/tests/system/coverage/clean.sh
+++ b/bin/tests/system/coverage/clean.sh
@@ -13,4 +13,5 @@ rm -f named-compilezone
 rm -f */K*.key
 rm -f */K*.private
 rm -rf coverage.*
+rm -rf dotted-dotless
 rm -f ns*/named.lock
diff --git a/bin/tests/system/coverage/tests.sh b/bin/tests/system/coverage/tests.sh
index f435eb8f0e..47a4589511 100644
--- a/bin/tests/system/coverage/tests.sh
+++ b/bin/tests/system/coverage/tests.sh
@@ -81,5 +81,17 @@ for dir in [0-9][0-9]-*; do
         status=`expr $status + $ret`
 done
 
+dir=dotted-dotless
+[ -d $dir ] || mkdir $dir
+echo_i "$dir"
+zsk1=`$KEYGEN -q -K $dir -a rsasha256 one.example`
+zsk2=`$KEYGEN -q -K $dir -a rsasha256 two.example`
+$COVERAGE -K $dir one.example. two.example > coverage.$n 2>&1
+grep one.example coverage.$n >/dev/null 2>&1 || ret=1
+grep two.example coverage.$n >/dev/null 2>&1 || ret=1
+n=`expr $n + 1`
+if [ $ret != 0 ]; then echo_i "failed"; fi
+status=`expr $status + $ret`
+
 echo_i "exit status: $status"
 [ $status -eq 0 ] || exit 1