diff --git a/DESCRIPTION b/DESCRIPTION
index 32b2b224..e03a4340 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -25,7 +25,7 @@ Description: Functions to simplify the analysis of Antimicrobial Resistance (AMR
     on antibiograms according to Leclercq (2013)
     <doi:10.1111/j.1469-0691.2011.03703.x>.
 Depends: R (>= 3.0)
-Imports: dplyr (>= 0.7.0), knitr, reshape2 (>= 1.4.0), xml2, rvest
+Imports: dplyr (>= 0.7.0), reshape2 (>= 1.4.0), xml2, rvest
 Suggests: testthat
 URL: https://cran.r-project.org/package=AMR
 BugReports: https://github.com/msberends/AMR/issues
diff --git a/tests/testthat/Rplots.pdf b/tests/testthat/Rplots.pdf
index e73617d6..386c2865 100644
Binary files a/tests/testthat/Rplots.pdf and b/tests/testthat/Rplots.pdf differ
diff --git a/tests/testthat/test-clipboard.R b/tests/testthat/test-clipboard.R
index 30123564..9fa622aa 100644
--- a/tests/testthat/test-clipboard.R
+++ b/tests/testthat/test-clipboard.R
@@ -1,9 +1,11 @@
 context("clipboard.R")
 
 test_that("clipboard works", {
-  # why is the <<- needed? Won't work without it...
-  t1 <<- AMR::antibiotics
-  clipboard_export(t1, info = FALSE)
-  t2 <- clipboard_import()
-  expect_equal(t1, t2)
+  if (Sys.info()['sysname'] == "Windows") {
+    # why is the <<- needed? Won't work without it...
+    t1 <<- AMR::antibiotics
+    clipboard_export(t1, info = FALSE)
+    t2 <- clipboard_import()
+    expect_equal(t1, t2)
+  }
 })