diff --git a/scenes/cornell.mtl b/scenes/cornell.mtl
index 9b25cf7d..1874cf6c 100644
--- a/scenes/cornell.mtl
+++ b/scenes/cornell.mtl
@@ -40,7 +40,7 @@ newmtl LeftBox
 	reflat0deg 0.3
 	reflat90deg 1.0
 	ni 1.55
-	transparency 0.0
+	tr 0.0
 	specularroughness 0.001
 
 newmtl RightBox
@@ -49,5 +49,5 @@ newmtl RightBox
 	reflat0deg 0.2
 	reflat90deg 1.0
 	ni 1.55
-	transparency 1.0
+	tr 1.0
 	specularroughness 0.001
diff --git a/scenes/cornell_textured.mtl b/scenes/cornell_textured.mtl
index 5a88df2d..353644ab 100644
--- a/scenes/cornell_textured.mtl
+++ b/scenes/cornell_textured.mtl
@@ -54,7 +54,7 @@ newmtl LeftBox
 	reflat0deg 0.3
 	reflAt90Deg 1.0
 	ni 1.55
-	transparency 0.0
+	tr 0.0
 	specularroughness 0.001
 
 newmtl RightBox
@@ -63,5 +63,5 @@ newmtl RightBox
 	reflat0deg 0.2
 	reflAt90Deg 1.0
 	ni 1.55
-	transparency 1.0
+	tr 1.0
 	specularroughness 0.001
diff --git a/scenes/cornellbottle2.mtl b/scenes/cornellbottle2.mtl
index 03f3d076..3e5ae953 100644
--- a/scenes/cornellbottle2.mtl
+++ b/scenes/cornellbottle2.mtl
@@ -39,7 +39,7 @@ newmtl Bottle
 	reflat0deg 0.1
 	reflat90deg 1.0
 	ni 1.4
-	transparency 1.0
+	tr 1.0
 
 newmtl Cork
 	kd 0.6745 0.5725 0.4902
diff --git a/wavefront/src/mtl.rs b/wavefront/src/mtl.rs
index 678dbaf3..cecdf6d2 100644
--- a/wavefront/src/mtl.rs
+++ b/wavefront/src/mtl.rs
@@ -119,7 +119,7 @@ where
             materials.last_mut().unwrap().reflection_90_degrees = x;
         } else if let Ok((_, x)) = tagged("ni", float, trimmed) {
             materials.last_mut().unwrap().index_of_refraction = x;
-        } else if let Ok((_, x)) = tagged("transparency", float, trimmed) {
+        } else if let Ok((_, x)) = tagged("tr", float, trimmed) {
             materials.last_mut().unwrap().transparency = x;
         } else if let Ok((_, _)) = tagged("specularroughness", float, trimmed) {
             // TODO: not supported
@@ -215,8 +215,8 @@ mod tests {
             0.5
         );
         assert_eq!(
-            mtl_test("newmtl m1\ntransparency 1.").materials[0].transparency,
-            1.
+            mtl_test("newmtl m1\ntr 0.5").materials[0].transparency,
+            0.5
         );
         assert_eq!(
             mtl_test("newmtl m1\nspecularroughness 1.").materials.len(),