diff --git a/libclamunrar/unrar.c b/libclamunrar/unrar.c
index 456da4d6f..40a3d63cb 100644
--- a/libclamunrar/unrar.c
+++ b/libclamunrar/unrar.c
@@ -469,7 +469,8 @@ static int read_tables(int fd, unpack_data_t *unpack_data)
 				rar_addbits(unpack_data, 7);
 			}
 			while (n-- > 0 && i < table_size) {
-				table[i] = table[i-1];
+				if (i>0)
+					table[i] = table[i-1];
 				i++;
 			}
 		} else {