diff --git a/nimdoc/testproject/expected/testproject.html b/nimdoc/testproject/expected/testproject.html
index 1ea9e172aa..b9ef507d24 100644
--- a/nimdoc/testproject/expected/testproject.html
+++ b/nimdoc/testproject/expected/testproject.html
@@ -44,7 +44,7 @@ function main() {
           localStorage.setItem('theme', 'light');
       }
   }
-
+  PRTEMP FAKE
   toggleSwitch.addEventListener('change', switchTheme, false);
 
   const currentTheme = localStorage.getItem('theme') ? localStorage.getItem('theme') : null;
@@ -57,7 +57,7 @@ function main() {
   }
 }
 
-window.addEventListener('DOMContentLoaded', main);
+window.addEventListener('DOMContentLoaded', main); PRTEMP FAKE
 </script>
 
 </head>
diff --git a/tests/concepts/tconcepts_issues.nim b/tests/concepts/tconcepts_issues.nim
index c76049bdde..fd3ddb371b 100644
--- a/tests/concepts/tconcepts_issues.nim
+++ b/tests/concepts/tconcepts_issues.nim
@@ -19,7 +19,7 @@ true
 true
 true
 true
-p has been called.
+p has been called. PRTEMP FAKE VAL to show effect of diffStrings
 p has been called.
 implicit generic
 generic
diff --git a/tests/osproc/treadlines.nim b/tests/osproc/treadlines.nim
index bcde19d7f1..e71ca5e23a 100644
--- a/tests/osproc/treadlines.nim
+++ b/tests/osproc/treadlines.nim
@@ -1,6 +1,7 @@
 discard """
   output: '''
-Error: cannot open 'a.nim'\31
+Error: cannot open 'a.nim'
+PRTEMP FAKE
 Error: cannot open 'b.nim'\31
 '''
   targets: "c"