diff --git a/tests/testthat/test-RunModel_Lag.R b/tests/testthat/test-RunModel_Lag.R
index d5ec5ff596263c6be42a25b9cc9d74ece95e8c45..59eddb6dbc4ce967cfdd9843e4b35561035a4dbb 100644
--- a/tests/testthat/test-RunModel_Lag.R
+++ b/tests/testthat/test-RunModel_Lag.R
@@ -51,7 +51,7 @@ test_that("'QupstrUnit' must correspond to one possible value", {
       BasinAreas = BasinAreas,
       QupstrUnit = "m3/h"
     ),
-    regexp = "'arg' should be one of “mm”, “m3”, “m3/s”, “l/s”"
+    regexp = "'arg' should be one of \"mm\", \"m3\", \"m3/s\", \"l/s\""
   )
 })