diff --git a/BeefLibs/corlib/src/NumberFormatter.bf b/BeefLibs/corlib/src/NumberFormatter.bf
index d4680f65..4f14c6db 100644
--- a/BeefLibs/corlib/src/NumberFormatter.bf
+++ b/BeefLibs/corlib/src/NumberFormatter.bf
@@ -2675,7 +2675,7 @@ namespace System
 				return;
 
 			int i = sb.Length + (end - start);
-			sb.Length = i;
+			sb.PrepareBuffer(i);
 
 			var end;
 			var start;
diff --git a/BeefLibs/corlib/src/String.bf b/BeefLibs/corlib/src/String.bf
index d426e8d4..9a8a0bb0 100644
--- a/BeefLibs/corlib/src/String.bf
+++ b/BeefLibs/corlib/src/String.bf
@@ -329,7 +329,7 @@ namespace System
 
 			set
 			{
-				Debug.Assert((uint)mLength <= (uint)value);
+				Debug.Assert((uint)value <= (uint)mLength);
 				mLength = (int_strsize)value;
 			}
 		}