diff --git a/R/ucrdtw.R b/R/ucrdtw.R
index dfec108..2db2d13 100644
--- a/R/ucrdtw.R
+++ b/R/ucrdtw.R
@@ -9,7 +9,7 @@
 #' @export
 #'
 summary.ucrdtw <- function(object, ...){
-  print(as.data.frame.list(object), row.names=FALSE, ...)
+  print(as.data.frame.list(object), row.names=FALSE, stringsAsFactors = FALSE, ...)
 }
 
 #' Summarize subsequence search
@@ -23,7 +23,7 @@ summary.ucrdtw <- function(object, ...){
 #' @export
 #'
 summary.ucred <- function(object, ...){
-  print(as.data.frame.list(object), row.names=FALSE, ...)
+  print(as.data.frame.list(object), row.names=FALSE, stringsAsFactors = FALSE, ...)
 }
 
 
diff --git a/data-raw/prepare_data.R b/data-raw/prepare_data.R
index 2358bc7..9a9e617 100644
--- a/data-raw/prepare_data.R
+++ b/data-raw/prepare_data.R
@@ -1,7 +1,7 @@
 #prepare package data
-synthetic_control <- read.table("data-raw/synthetic_control.data")
+synthetic_control <- read.table("data-raw/synthetic_control.data", stringsAsFactors = FALSE)
 synthetic_control <- as.matrix(synthetic_control)
-devtools::use_data(synthetic_control)
+usethis::use_data(synthetic_control, overwrite = TRUE)
 #write out data file as one long line
 write.table(as.vector(t(synthetic_control)), "inst/extdata/col_sc.txt", row.names=FALSE, col.names=FALSE)
 #write out query files
diff --git a/data/synthetic_control.rda b/data/synthetic_control.rda
index c798497..35f8658 100644
Binary files a/data/synthetic_control.rda and b/data/synthetic_control.rda differ
diff --git a/rucrdtw.Rproj b/rucrdtw.Rproj
index f0d6187..ea5edfe 100644
--- a/rucrdtw.Rproj
+++ b/rucrdtw.Rproj
@@ -17,5 +17,5 @@ StripTrailingWhitespace: Yes
 
 BuildType: Package
 PackageUseDevtools: Yes
-PackageInstallArgs: --no-multiarch --with-keep.source
+PackageInstallArgs: --with-keep.source
 PackageRoxygenize: rd,collate,namespace,vignette