diff --git a/ci-scripts/oai-ci-vm-tool b/ci-scripts/oai-ci-vm-tool
index 1375fb6194..940bcd2852 100755
--- a/ci-scripts/oai-ci-vm-tool
+++ b/ci-scripts/oai-ci-vm-tool
@@ -254,6 +254,7 @@ case $key in
     LOG_PATTERN=.Rel15.txt
     NB_PATTERN_FILES=8
     BUILD_OPTIONS="--phy_simulators"
+    VM_MEMORY=4096
     RUN_OPTIONS="./run_exec_autotests.bash -g \"01510*\" -q -np -b"
     NBARGS=$[$NBARGS+256]
     shift
@@ -332,6 +333,7 @@ case $key in
         LOG_PATTERN=.Rel15.txt
         NB_PATTERN_FILES=8
         BUILD_OPTIONS="--phy_simulators"
+	VM_MEMORY=4096
         RUN_OPTIONS="./run_exec_autotests.bash -g \"01510*\" -q -np -b"
         NBARGS=$[$NBARGS+256]
         ;;
diff --git a/cmake_targets/autotests/test_case_list.xml b/cmake_targets/autotests/test_case_list.xml
index a26191e710..2f66c6af34 100644
--- a/cmake_targets/autotests/test_case_list.xml
+++ b/cmake_targets/autotests/test_case_list.xml
@@ -1067,10 +1067,10 @@
       <main_exec> $OPENAIR_DIR/targets/bin/nr_pbchsim.Rel15</main_exec>
       <main_exec_args>-s0 -S1 -n1000 -R106
                       -s0 -S1 -n10 -I -R106
-		      -s0 -S1 -n1000 -R217 -N10
-                      -s0 -S1 -n10 -I -R217 -N10
-		      -s0 -S1 -n1000 -R273 -N20
-                      -s0 -S1 -n10 -I -R273 -N20</main_exec_args>
+		      -s0 -S1 -n1000 -R217
+                      -s0 -S1 -n10 -I -R217
+		      -s0 -S1 -n1000 -R273
+                      -s0 -S1 -n10 -I -R273</main_exec_args>
       <tags>nr_pbchsim.test1 nr_pbchsim.test2</tags>
       <search_expr_true>PBCH test OK</search_expr_true>
       <search_expr_false>segmentation fault|assertion|exiting|fatal</search_expr_false>