diff --git a/src/pmc/nummatrix2d.pmc b/src/pmc/nummatrix2d.pmc
index 6259b36..d5cc43a 100644
--- a/src/pmc/nummatrix2d.pmc
+++ b/src/pmc/nummatrix2d.pmc
@@ -255,6 +255,30 @@ pmclass NumMatrix2D dynpmc auto_attrs {
         return PMCNULL;
     }
 
+    VTABLE PMC * clone() {
+        PMC * const c = pmc_new(INTERP, SELF->vtable->base_type);
+        Parrot_NumMatrix2D_attributes * const old_atts =
+            (Parrot_NumMatrix2D_attributes *)PARROT_NUMMATRIX2D(SELF);
+        Parrot_NumMatrix2D_attributes * const new_atts =
+            (Parrot_NumMatrix2D_attributes *)PARROT_NUMMATRIX2D(c);
+        INTVAL x, y;
+        INTVAL const x_size = old_attrs->x;
+        INTVAL const y_size = old_attrs->y;
+        INTVAL const newsize = x_size * y_size;
+        FLOATVAL * old_s = old_attrs->storage;
+        FLOATVAL * new_s = (FLOATVAL *)mem_sys_allocate_zeroed(newsize * sizeof (FLOATVAL));
+        for (x = 0; x < x_size; ++x) {
+            for (y = 0; y < y_size; ++y) {
+                ITEM_XY_ROWMAJOR(new_s, x_size, y_size, x, y) =
+                    ITEM_XY_ROWMAJOR(old_s, x_size, y_size, x, y);
+            }
+        }
+        new_attrs->storage = new_s;
+        new_attrs->x = x_size;
+        new_attrs->y = y_size;
+        return c;
+    }
+
     METHOD fill(FLOATVAL value) {
         Parrot_NumMatrix2D_attributes * const attrs
           = (Parrot_NumMatrix2D_attributes *) PARROT_NUMMATRIX2D(SELF);
@@ -315,7 +339,7 @@ pmclass NumMatrix2D dynpmc auto_attrs {
             for (j = 0; j < min_y; j++) {
                 FLOATVAL value = ITEM_XY_ROWMAJOR(old_s, x, y, i, j);
                 FLOATVAL result = 0.0;
-                Parrot_ext_call(INTERP, func, "PiNPf->N", SELF, value, args, &result);
+                Parrot_ext_call(INTERP, func, "PNPf->N", SELF, value, args, &result);
                 ITEM_XY_ROWMAJOR(new_s, x, y, i, j) = result;
             }
         }