diff --git a/gr-hamnet70/lib/symbol_interleaver_impl.cc b/gr-hamnet70/lib/symbol_interleaver_impl.cc
index b10e8d6..9d97118 100644
--- a/gr-hamnet70/lib/symbol_interleaver_impl.cc
+++ b/gr-hamnet70/lib/symbol_interleaver_impl.cc
@@ -75,8 +75,10 @@ namespace gr {
 			size_t nfullcols = nitems % d_width;
 
 			size_t nrows = nitems / d_width;
-			if(nitems % nrows != 0) {
+			if(nfullcols != 0) {
 				nrows++;
+			} else {
+				nfullcols = ncols;
 			}
 
 			size_t row = 0;