diff --git a/lib/Slic3r/GUI/PreviewCanvas.pm b/lib/Slic3r/GUI/PreviewCanvas.pm
index bb601fd3..691080ae 100644
--- a/lib/Slic3r/GUI/PreviewCanvas.pm
+++ b/lib/Slic3r/GUI/PreviewCanvas.pm
@@ -121,7 +121,7 @@ sub trackball {
 
 sub quat_to_rotmatrix {
   my ($q) = @_;
-  my (@m);
+  my @m;
   $m[0] = 1.0 - 2.0 * (@$q[1] * @$q[1] + @$q[2] * @$q[2]);
   $m[1] = 2.0 * (@$q[0] * @$q[1] - @$q[2] * @$q[3]);
   $m[2] = 2.0 * (@$q[2] * @$q[0] + @$q[1] * @$q[3]);