diff --git a/src/parallel b/src/parallel
index 57bd913d..9399337e 100755
--- a/src/parallel
+++ b/src/parallel
@@ -5450,9 +5450,9 @@ sub set_non_blocking {
     for my $fdno (1,2) {
 	my $fdr = $self->fh($fdno,'r');
 	my $flags;
-	fcntl($fdr, &F_GETFL, $flags) || die $!; # Get the current flags on the filehandle
-	$flags |= &O_NONBLOCK; # Add non-blocking to the flags
-	fcntl($fdr, &F_SETFL, $flags) || die $!; # Set the flags on the filehandle
+	fcntl($fdr, &::F_GETFL, $flags) || die $!; # Get the current flags on the filehandle
+	$flags |= &::O_NONBLOCK; # Add non-blocking to the flags
+	fcntl($fdr, &::F_SETFL, $flags) || die $!; # Set the flags on the filehandle
     }
 }
 
diff --git a/testsuite/tests-to-run/sem01.sh b/testsuite/tests-to-run/sem01.sh
index 5efb9c17..31f64af7 100755
--- a/testsuite/tests-to-run/sem01.sh
+++ b/testsuite/tests-to-run/sem01.sh
@@ -42,3 +42,6 @@ sem --wait
 
 echo '### Test bug #33621: --bg -p should give an error message'
 stdout parallel -p --bg echo x{}
+
+echo '### Failed on 20141226'
+sem --fg --line-buffer --id lock_id echo OK
diff --git a/testsuite/wanted-results/sem01 b/testsuite/wanted-results/sem01
index c91ae202..b8c18b52 100644
--- a/testsuite/wanted-results/sem01
+++ b/testsuite/wanted-results/sem01
@@ -96,3 +96,5 @@ done 4
 40
 ### Test bug #33621: --bg -p should give an error message
 parallel: Error: Jobs running in the background cannot be interactive.
+### Failed on 20141226
+OK