diff --git a/regression-tests/Makefile.simulation-test b/regression-tests/Makefile.simulation-test
index 58818c328..9995eeea8 100644
--- a/regression-tests/Makefile.simulation-test
+++ b/regression-tests/Makefile.simulation-test
@@ -31,7 +31,7 @@ TESTLOGS=$(patsubst %.csc,%.testlog,$(TESTS))
 LOGS=$(patsubst %.csc,%.log,$(TESTS))
 FAILLOGS=$(patsubst %.csc,%.*.faillog,$(TESTS))
 #Set random seeds to create reproduceable results.
-RANDOMSEED=1 5
+RANDOMSEED=1
 
 CONTIKI=../..