diff --git a/R/analyse_pIRIRSequence.R b/R/analyse_pIRIRSequence.R
index 1d6e5d0de..e5873c8ef 100644
--- a/R/analyse_pIRIRSequence.R
+++ b/R/analyse_pIRIRSequence.R
@@ -282,10 +282,10 @@ analyse_pIRIRSequence <- function(
 
   ## CHECK FOR PLOT ...we safe users the pain by checking whether plot device has the
   ## required size.
-    if (plot[1] && plot.single && all(grDevices::dev.size("in") < 20)) {
+    if (plot[1] && !plot.single && all(grDevices::dev.size("in") < 18)) {
       plot <- FALSE
       .throw_warning("Argument 'plot' reset to 'FALSE'. The smallest plot ",
-                     "size required is 20 x 20 in.\n",
+                     "size required is 18 x 18 in.\n",
                      "Consider plotting via `pdf(..., height = 20, width = 20)` ",
                      "or setting `plot.single = FALSE`")
     }
diff --git a/tests/testthat/test_analyse_pIRIRSequence.R b/tests/testthat/test_analyse_pIRIRSequence.R
index fdb65ff44..9e40fbe2a 100644
--- a/tests/testthat/test_analyse_pIRIRSequence.R
+++ b/tests/testthat/test_analyse_pIRIRSequence.R
@@ -64,10 +64,24 @@ test_that("check plot stuff", {
     sequence.structure = c("TL", "pseudoIRSL1", "pseudoIRSL2"),
     main = "Pseudo pIRIR data set based on quartz OSL",
     plot = TRUE,
-    plot.single = TRUE,
+    plot.single = FALSE,
     verbose = FALSE),
     "[analyse_pIRIRSequence()] Argument 'plot' reset to 'FALSE'",
     fixed = TRUE)
+  
+  ## here it should not throw any warning because we used plot.single = TRUE
+  expect_silent(analyse_pIRIRSequence(
+    object,
+    signal.integral.min = 1,
+    signal.integral.max = 2,
+    background.integral.min = 900,
+    background.integral.max = 1000,
+    fit.method = "EXP",
+    sequence.structure = c("TL", "pseudoIRSL1", "pseudoIRSL2"),
+    main = "Pseudo pIRIR data set based on quartz OSL",
+    plot = TRUE,
+    plot.single = TRUE,
+    verbose = FALSE))
 })
 
 test_that("input validation", {