diff --git a/common/terrain_types/00_terrains.txt b/common/terrain_types/00_terrains.txt
index 27b1479b..a20776f0 100644
--- a/common/terrain_types/00_terrains.txt
+++ b/common/terrain_types/00_terrains.txt
@@ -51,7 +51,7 @@ farmlands = {
 	province_modifier = {
 		supply_limit_mult = 0.5
 		county_fertility_growth_add = farmlands_county_fertility_value
-		monthly_county_control_decline_add = 0.15
+		monthly_county_control_decline_factor = 0.15
 	}
 
 	county_capital_modifier = {
@@ -72,7 +72,7 @@ hills = {
 		supply_limit_mult = -0.1
 		travel_danger = hills_danger_value
 		county_fertility_growth_add = hills_county_fertility_value
-		monthly_county_control_decline_add = -0.15
+		monthly_county_control_decline_factor = -0.15
 		fort_level = 1
 	}
 	attacker_modifier = {
@@ -105,7 +105,7 @@ mountains = {
 		supply_limit_mult = -0.5
 		travel_danger = mountains_danger_value
 		county_fertility_growth_add = mountains_county_fertility_value
-		monthly_county_control_decline_add = -0.2
+		monthly_county_control_decline_factor = -0.2
 		fort_level = 2
 	}
 	attacker_modifier = {
@@ -139,7 +139,7 @@ desert = {
 		supply_limit_mult = -0.3
 		travel_danger = desert_danger_value
 		county_fertility_growth_add = desert_county_fertility_value
-		monthly_county_control_decline_add = -0.1
+		monthly_county_control_decline_factor = -0.1
 	}
 	attacker_modifier = {
 		hostile_county_attrition = 0.015
@@ -165,7 +165,7 @@ desert_mountains = {
 		supply_limit_mult = -0.6
 		travel_danger = desert_mountains_danger_value
 		county_fertility_growth_add = desert_mountains_county_fertility_value
-		monthly_county_control_decline_add = -0.2
+		monthly_county_control_decline_factor = -0.2
 		fort_level = 2
 	}
 	attacker_modifier = {
@@ -225,7 +225,7 @@ jungle = {
 		supply_limit_mult = -0.25
 		travel_danger = jungle_danger_value
 		county_fertility_growth_add = jungle_county_fertility_value
-		monthly_county_control_decline_add = -0.2
+		monthly_county_control_decline_factor = -0.2
 		fort_level = 1
 	}
 	attacker_modifier = {
@@ -259,7 +259,7 @@ forest = {
 		supply_limit_mult = -0.1
 		travel_danger = forest_danger_value
 		county_fertility_growth_add = forest_county_fertility_value
-		monthly_county_control_decline_add = -0.15
+		monthly_county_control_decline_factor = -0.15
 	}
 	
 	defender_combat_effects = {
@@ -287,7 +287,7 @@ taiga = {
 		supply_limit_mult = -0.2
 		travel_danger = taiga_danger_value
 		county_fertility_growth_add = taiga_county_fertility_value
-		monthly_county_control_decline_add = -0.2
+		monthly_county_control_decline_factor = -0.2
 		hostile_county_attrition = 0.025
 	}
 
@@ -318,7 +318,7 @@ wetlands = {
 		supply_limit_mult = -0.25
 		travel_danger = wetlands_danger_value
 		county_fertility_growth_add = wetlands_county_fertility_value
-		monthly_county_control_decline_add = -0.2
+		monthly_county_control_decline_factor = -0.2
 		fort_level = 1
 	}
 
@@ -359,7 +359,7 @@ steppe = {
 		supply_limit_mult = 0
 		travel_danger = steppe_danger_value
 		county_fertility_growth_add = steppe_county_fertility_value
-		monthly_county_control_decline_add = -0.15
+		monthly_county_control_decline_factor = -0.15
 		fort_level = -1
 	}
 
@@ -424,7 +424,7 @@ tells = {
 		supply_limit_mult = -0.1
 		travel_danger = hills_danger_value
 		county_fertility_growth_add = hills_county_fertility_value
-		monthly_county_control_decline_add = -0.015
+		monthly_county_control_decline_factor = -0.015
 		fort_level = 1
 	}