diff --git a/mappings/com/mojang/blaze3d/platform/GlStateManager.mapping b/mappings/com/mojang/blaze3d/platform/GlStateManager.mapping
index b4ab233f64..d9a8391581 100644
--- a/mappings/com/mojang/blaze3d/platform/GlStateManager.mapping
+++ b/mappings/com/mojang/blaze3d/platform/GlStateManager.mapping
@@ -80,6 +80,8 @@ CLASS net/minecraft/class_4493 com/mojang/blaze3d/platform/GlStateManager
 		FIELD field_5170 width I
 		FIELD field_5171 y I
 		FIELD field_5172 x I
+	CLASS class_4534 DestFactor
+	CLASS class_4535 SourceFactor
 	FIELD field_20466 MATRIX_BUFFER Ljava/nio/FloatBuffer;
 	FIELD field_20468 ALPHA_TEST Lnet/minecraft/class_4493$class_1016;
 	FIELD field_20469 LIGHTING Lnet/minecraft/class_4493$class_1018;