diff --git a/src/transform/renamer.cc b/src/transform/renamer.cc
index 956d407..d3d0cf9 100644
--- a/src/transform/renamer.cc
+++ b/src/transform/renamer.cc
@@ -745,6 +745,7 @@
     "long3",
     "long4",
     "main",
+    "matrix",
     "metal",
     "mutable",
     "namespace",
diff --git a/src/transform/renamer_test.cc b/src/transform/renamer_test.cc
index 9b9ff3f..2b07a39 100644
--- a/src/transform/renamer_test.cc
+++ b/src/transform/renamer_test.cc
@@ -1045,6 +1045,7 @@
         "long3",
         "long4",
         "main",   // No functions called main
+        "matrix",
         "metal",  // The namespace
         "packed_bool2",
         "packed_bool3",