diff --git a/Source/Core/Data/TexturePatch.cs b/Source/Core/Data/TexturePatch.cs
index 7820cc2895b7fe718c15c685b631dafbbbc7611c..ffda23e14dc2405238a9549ed17b6da5345eac09 100755
--- a/Source/Core/Data/TexturePatch.cs
+++ b/Source/Core/Data/TexturePatch.cs
@@ -65,7 +65,7 @@ namespace CodeImp.DoomBuilder.Data
 			// Initialize
 			this.LumpName = lumpname;
 			this.X = x;
-			this.Y = y;
+			this.Y = y < 0 ? 0 : y;
 			this.FlipX = false;
 			this.FlipY = false;
 			this.Rotate = 0;