diff --git a/common/rc b/common/rc
index edfba5d2..e1ab2c67 100644
--- a/common/rc
+++ b/common/rc
@@ -1496,7 +1496,7 @@ _require_scratch_nocheck()
 {
     case "$FSTYP" in
 	glusterfs)
-		echo $SCRATCH_DEV | grep -q "\w:\w" > /dev/null 2>&1
+		echo $SCRATCH_DEV | egrep -q ":/?" > /dev/null 2>&1
 		if [ -z "$SCRATCH_DEV" -o "$?" != "0" ]; then
 			_notrun "this test requires a valid \$SCRATCH_DEV"
 		fi
@@ -1584,7 +1584,7 @@ _require_test()
 {
     case "$FSTYP" in
 	glusterfs)
-		echo $TEST_DEV | grep -q "\w:\w" > /dev/null 2>&1
+		echo $TEST_DEV | egrep -q ":/?" > /dev/null 2>&1
 		if [ -z "$TEST_DEV" -o "$?" != "0" ]; then
 			_notrun "this test requires a valid \$TEST_DEV"
 		fi