diff --git a/engines/grim/gfx_opengl_shaders.cpp b/engines/grim/gfx_opengl_shaders.cpp
index 944d5467e11..36141eb4482 100644
--- a/engines/grim/gfx_opengl_shaders.cpp
+++ b/engines/grim/gfx_opengl_shaders.cpp
@@ -1275,7 +1275,9 @@ void GfxOpenGLS::createBitmap(BitmapData *bitmap) {
 				if (val == 0xf81f) {
 					val = 0;
 				}
-				zbufPtr[i] = 0xffff - ((uint32)val) * 0x10000 / 100 / (0x10000 - val);
+				// This is later read as a LA pair when filling texture
+				// with L being used as the LSB in fragment shader
+				zbufPtr[i] = TO_LE_16(0xffff - ((uint32)val) * 0x10000 / 100 / (0x10000 - val));
 			}
 		}
 	}