diff --git a/ROMFS/px4fmu_common/init.d/rc.mc_defaults b/ROMFS/px4fmu_common/init.d/rc.mc_defaults
index eb103b9614..dde212f026 100644
--- a/ROMFS/px4fmu_common/init.d/rc.mc_defaults
+++ b/ROMFS/px4fmu_common/init.d/rc.mc_defaults
@@ -31,3 +31,17 @@ set PWM_AUX_OUT 1234
 set PWM_AUX_DISARMED 1500
 set PWM_AUX_MIN 1000
 set PWM_AUX_MAX 2000
+
+# Transitional support: ensure suitable PWM min/max param values
+if param compare PWM_MIN 1000
+then
+	param set PWM_MIN 1075
+fi
+if param compare PWM_MAX 2000
+then
+	param set PWM_MAX 1950
+fi
+if param compare PWM_DISARMED 0
+then
+	param set PWM_DISARMED 900
+fi
diff --git a/ROMFS/px4fmu_common/init.d/rc.vtol_defaults b/ROMFS/px4fmu_common/init.d/rc.vtol_defaults
index 397e73c63a..dac203ddf1 100644
--- a/ROMFS/px4fmu_common/init.d/rc.vtol_defaults
+++ b/ROMFS/px4fmu_common/init.d/rc.vtol_defaults
@@ -32,3 +32,17 @@ set PWM_RATE 400
 set PWM_DISARMED p:PWM_DISARMED
 set PWM_MIN p:PWM_MIN
 set PWM_MAX p:PWM_MAX
+
+# Transitional support: ensure suitable PWM min/max param values
+if param compare PWM_MIN 1000
+then
+	param set PWM_MIN 1075
+fi
+if param compare PWM_MAX 2000
+then
+	param set PWM_MAX 1950
+fi
+if param compare PWM_DISARMED 0
+then
+	param set PWM_DISARMED 900
+fi