diff --git a/lib/linguist/blob_helper.rb b/lib/linguist/blob_helper.rb
index b1e284ca..68dbce7d 100644
--- a/lib/linguist/blob_helper.rb
+++ b/lib/linguist/blob_helper.rb
@@ -155,7 +155,7 @@ module Linguist
     #
     # Return true or false
     def solid?
-      ['.stl', '.obj'].include?(extname)
+      extname.downcase == '.stl'
     end
 
     MEGABYTE = 1024 * 1024
diff --git a/samples/Text/cube.obj b/samples/Text/cube.obj
deleted file mode 100644
index 5da92710..00000000
--- a/samples/Text/cube.obj
+++ /dev/null
@@ -1,33 +0,0 @@
-# test_file
-v -18.500000 -24.500000 31.000000
-v -18.500000 -24.500000 -0.001000
-v 12.500000 -24.500000 -0.001000
-v 12.500000 -24.500000 31.000000
-v -18.500000 6.500000 31.000000
-v -18.500000 6.500000 -0.001000
-v 12.500000 6.500000 31.000000
-v 12.500000 6.500000 -0.001000
-vn 0.000000 -1.000000 0.000000,
-vn 0.000000 -1.000000 0.000000,
-vn -1.000000 0.000000 0.000000,
-vn -1.000000 0.000000 0.000000,
-vn 0.000000 1.000000 0.000000,
-vn 0.000000 1.000000 0.000000,
-vn 1.000000 0.000000 0.000000,
-vn 1.000000 0.000000 0.000000,
-vn 0.000000 0.000000 -1.000000,
-vn 0.000000 0.000000 -1.000000,
-vn 0.000000 0.000000 1.000000,
-vn 0.000000 0.000000 1.000000,
-f 1//1 2//1 3//1
-f 1//4 3//4 4//4
-f 5//7 6//7 2//7
-f 5//10 2//10 1//10
-f 6//13 5//13 7//13
-f 6//16 7//16 8//16
-f 7//19 4//19 3//19
-f 7//22 3//22 8//22
-f 8//25 3//25 2//25
-f 8//28 2//28 6//28
-f 5//31 1//31 4//31
-f 5//34 4//34 7//34
diff --git a/test/test_blob.rb b/test/test_blob.rb
index 4bc07697..d79fe64b 100644
--- a/test/test_blob.rb
+++ b/test/test_blob.rb
@@ -135,7 +135,6 @@ class TestBlob < Test::Unit::TestCase
   def test_solid
     assert blob("Binary/cube.stl").solid?
     assert blob("Text/cube.stl").solid?
-    assert blob("Text/cube.obj").solid?
   end
 
   def test_viewable