1 files changed, 1 insertions, 1 deletions
diff --git a/src/Mapping.c b/src/Mapping.c
index 96b8846..d0ebc42 100644
--- a/src/Mapping.c
+++ b/src/Mapping.c
@@ -368,7 +368,7 @@ static CCTK_INT DefineMapping (const cGH      *GH,
   real_extent = malloc (vinfo.dim * sizeof (CCTK_INT));
   for (vdim = dim = 0; vdim < vinfo.dim; vdim++)
   {
-    real_extent[vdim] = extent[vdim];
+    real_extent[vdim] = vdim < hdim ? extent[vdim] : -1;
     if (real_extent[vdim] < 0)
     {
       real_extent[vdim] = extras->nsize[vdim];