diff --git a/.editorconfig b/.editorconfig
index b0f0d10eb8..33adb71f86 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -183,6 +183,9 @@ dotnet_diagnostic.IDE0051.severity = warning
 # Remove unread private member.
 dotnet_diagnostic.IDE0052.severity = warning
 
+# Use compound assignment.
+dotnet_diagnostic.IDE0054.severity = warning
+
 # Unnecessary value assignment.
 dotnet_diagnostic.IDE0059.severity = warning
 
diff --git a/OpenRA.Mods.Cnc/FileFormats/BlowfishKeyProvider.cs b/OpenRA.Mods.Cnc/FileFormats/BlowfishKeyProvider.cs
index ed4d65b5d5..e966665558 100644
--- a/OpenRA.Mods.Cnc/FileFormats/BlowfishKeyProvider.cs
+++ b/OpenRA.Mods.Cnc/FileFormats/BlowfishKeyProvider.cs
@@ -144,7 +144,7 @@ namespace OpenRA.Mods.Cnc.FileFormats
 			{
 				for (i = 0; i < len - i2; i++) n[i] = n[i + i2];
 				for (; i < len; i++) n[i] = 0;
-				bits = bits % 32;
+				bits %= 32;
 			}
 
 			if (bits == 0) return;
@@ -161,7 +161,7 @@ namespace OpenRA.Mods.Cnc.FileFormats
 			{
 				for (i = len - 1; i > i2; i--) n[i] = n[i - i2];
 				for (; i > 0; i--) n[i] = 0;
-				bits = bits % 32;
+				bits %= 32;
 			}
 
 			if (bits == 0) return;
diff --git a/OpenRA.Mods.Common/Traits/SupportPowers/AirstrikePower.cs b/OpenRA.Mods.Common/Traits/SupportPowers/AirstrikePower.cs
index 59d3fb9432..b042ea576c 100644
--- a/OpenRA.Mods.Common/Traits/SupportPowers/AirstrikePower.cs
+++ b/OpenRA.Mods.Common/Traits/SupportPowers/AirstrikePower.cs
@@ -86,7 +86,7 @@ namespace OpenRA.Mods.Common.Traits
 			var altitude = self.World.Map.Rules.Actors[info.UnitType].TraitInfo<AircraftInfo>().CruiseAltitude.Length;
 			var attackRotation = WRot.FromYaw(facing.Value);
 			var delta = new WVec(0, -1024, 0).Rotate(attackRotation);
-			target = target + new WVec(0, 0, altitude);
+			target += new WVec(0, 0, altitude);
 			var startEdge = target - (self.World.Map.DistanceToEdge(target, -delta) + info.Cordon).Length * delta / 1024;
 			var finishEdge = target + (self.World.Map.DistanceToEdge(target, delta) + info.Cordon).Length * delta / 1024;