diff --git a/OpenRA.FileFormats/FileFormats/CRC32.cs b/OpenRA.FileFormats/FileFormats/CRC32.cs
index 22fd2077c5..61de944e55 100644
--- a/OpenRA.FileFormats/FileFormats/CRC32.cs
+++ b/OpenRA.FileFormats/FileFormats/CRC32.cs
@@ -96,14 +96,18 @@ namespace OpenRA.FileFormats
 		/// <returns>
 		/// The calculated checksum.
 		/// </returns>
-		public static uint Calculate(byte[] data, uint polynomal = 0xFFFFFFFF)
+		public static uint Calculate(byte[] data, uint polynomial)
 		{
-			uint crc = polynomal;
+			uint crc = polynomial;
 			for (int i = 0; i < data.Length; i++)
 				crc = (crc >> 8) ^ lookUp[(crc & 0xFF) ^ data[i]];
-			crc ^= polynomal;
+			crc ^= polynomial;
 			return crc;
 		}
+		public static uint Calculate(byte[] data)
+		{
+			return Calculate(data, 0xFFFFFFFF);
+		}
 
 		/// <summary>
 		/// A fast (native) CRC32 implementation that can be used on a pinned byte array using
@@ -113,13 +117,17 @@ namespace OpenRA.FileFormats
 		/// <param name="len">		The length of the data data.</param>
 		/// <param name="polynomal">The polynomal to xor with.</param>
 		/// <returns>The calculated checksum.</returns>
-		public static unsafe uint Calculate(byte* data, uint len, uint polynomal = 0xFFFFFFFF)
+		public static unsafe uint Calculate(byte* data, uint len, uint polynomial)
 		{
-			uint crc = polynomal;
+			uint crc = polynomial;
 			for (int i = 0; i < len; i++)
 				crc = (crc >> 8) ^ lookUp[(crc & 0xFF) ^ *data++];
-			crc ^= polynomal;
+			crc ^= polynomial;
 			return crc;
 		}
+		public static unsafe uint Calculate(byte* data, uint len)
+		{
+			return Calculate(data, len, 0xFFFFFFFF);
+		}
 	}
 }
\ No newline at end of file
diff --git a/OpenRA.Mods.RA/AI/HackyAI.cs b/OpenRA.Mods.RA/AI/HackyAI.cs
index 7bb15d84e6..c25260e0ca 100644
--- a/OpenRA.Mods.RA/AI/HackyAI.cs
+++ b/OpenRA.Mods.RA/AI/HackyAI.cs
@@ -500,12 +500,16 @@ namespace OpenRA.Mods.RA.AI
 			return squads.Where(s => s.type == type).FirstOrDefault();
 		}
 
-		Squad RegisterNewSquad(SquadType type, Actor target = null)
+		Squad RegisterNewSquad(SquadType type, Actor target)
 		{
 			var ret = new Squad(this, type, target);
 			squads.Add(ret);
 			return ret;
 		}
+		Squad RegisterNewSquad(SquadType type)
+		{
+			return RegisterNewSquad(type, null);
+		}
 
 		int assignRolesTicks = 0;
 		int rushTicks = 0;