diff --git a/regression-tests/04-rime/01-cooja-collect.csc b/regression-tests/04-rime/01-cooja-collect.csc
index e831dc5fb..f9166fc52 100644
--- a/regression-tests/04-rime/01-cooja-collect.csc
+++ b/regression-tests/04-rime/01-cooja-collect.csc
@@ -12,7 +12,7 @@
   <simulation>
     <title>Rime collect test</title>
     <delaytime>0</delaytime>
-    <randomseed>generated</randomseed>
+    <randomseed>1</randomseed>
     <motedelay_us>10000000</motedelay_us>
     <radiomedium>
       se.sics.cooja.radiomediums.UDGM
diff --git a/regression-tests/04-rime/05-sky-runicast.csc b/regression-tests/04-rime/05-sky-runicast.csc
index 79b3f0b0b..3dc029228 100644
--- a/regression-tests/04-rime/05-sky-runicast.csc
+++ b/regression-tests/04-rime/05-sky-runicast.csc
@@ -7,7 +7,7 @@
   <simulation>
     <title>My simulation</title>
     <delaytime>0</delaytime>
-    <randomseed>generated</randomseed>
+    <randomseed>1</randomseed>
     <motedelay_us>10000000</motedelay_us>
     <radiomedium>
       se.sics.cooja.radiomediums.UDGM
diff --git a/regression-tests/06-shell/04-sky-shell-download.csc b/regression-tests/06-shell/04-sky-shell-download.csc
index bf41c18a6..0f00bb826 100644
--- a/regression-tests/06-shell/04-sky-shell-download.csc
+++ b/regression-tests/06-shell/04-sky-shell-download.csc
@@ -3,7 +3,7 @@
   <simulation>
     <title>My simulation</title>
     <delaytime>-2147483648</delaytime>
-    <randomseed>generated</randomseed>
+    <randomseed>1</randomseed>
     <motedelay_us>1000000</motedelay_us>
     <radiomedium>
       se.sics.cooja.radiomediums.UDGM