diff --git a/src/sspred_avpred.c b/src/sspred_avpred.c
index 37b1332..4f04ab6 100644
--- a/src/sspred_avpred.c
+++ b/src/sspred_avpred.c
@@ -223,7 +223,7 @@ predict(int argc, char **argv)
 int             getmtx(FILE *lfil)
 {
     int             aa, i, j, naa;
-    char            buf[256], *p;
+    char            buf[65536], *p;
     
     if (fscanf(lfil, "%d", &naa) != 1)
 	fail("Bad mtx file - no sequence length!");