diff --git a/test/units/testsuite-55-testbloat.service b/test/units/testsuite-55-testbloat.service
index 675273ab47e..8ec535979df 100644
--- a/test/units/testsuite-55-testbloat.service
+++ b/test/units/testsuite-55-testbloat.service
@@ -5,6 +5,6 @@ Description=Create a lot of memory pressure
 [Service]
 # A VERY small memory.high will cause the script (trying to use a lot of memory)
 # to throttle and be put under heavy pressure.
-MemoryHigh=1M
+MemoryHigh=5M
 Slice=testsuite-55-workload.slice
 ExecStart=/usr/lib/systemd/tests/testdata/units/testsuite-55-slowgrowth.sh
diff --git a/test/units/testsuite-55-testchill.service b/test/units/testsuite-55-testchill.service
index 49028e8ddc3..369b8029d37 100644
--- a/test/units/testsuite-55-testchill.service
+++ b/test/units/testsuite-55-testchill.service
@@ -3,5 +3,6 @@
 Description=No memory pressure
 
 [Service]
+MemoryHigh=3M
 Slice=testsuite-55-workload.slice
 ExecStart=sleep infinity
diff --git a/test/units/testsuite-55-testmunch.service b/test/units/testsuite-55-testmunch.service
index 3b649314549..8820dc06782 100644
--- a/test/units/testsuite-55-testmunch.service
+++ b/test/units/testsuite-55-testmunch.service
@@ -3,6 +3,6 @@
 Description=Create some memory pressure
 
 [Service]
-MemoryHigh=2M
+MemoryHigh=6M
 Slice=testsuite-55-workload.slice
 ExecStart=/usr/lib/systemd/tests/testdata/units/testsuite-55-slowgrowth.sh