diff --git a/scripts/regression/regression.mk b/scripts/regression/regression.mk
index 1ebb27f..d132bd5 100644
--- a/scripts/regression/regression.mk
+++ b/scripts/regression/regression.mk
@@ -21,11 +21,11 @@ regression_random_linux:
 
 regression_random_machine_os:
 	cd ../..
-	export VEXRISCV_REGRESSION_CONFIG_COUNT=30
+	export VEXRISCV_REGRESSION_CONFIG_COUNT=25
 	export VEXRISCV_REGRESSION_CONFIG_LINUX_RATE=0.0
 	export VEXRISCV_REGRESSION_CONFIG_MACHINE_OS_RATE=1.0
-	export VEXRISCV_REGRESSION_FREERTOS_COUNT=2
-	export VEXRISCV_REGRESSION_ZEPHYR_COUNT=4
+	export VEXRISCV_REGRESSION_FREERTOS_COUNT=1
+	export VEXRISCV_REGRESSION_ZEPHYR_COUNT=2
 	export VEXRISCV_REGRESSION_THREAD_COUNT=1
 	sbt "testOnly vexriscv.TestIndividualFeatures"