diff --git a/src/transform/canonicalize_entry_point_io.cc b/src/transform/canonicalize_entry_point_io.cc
index 72c88b4..f655b30 100644
--- a/src/transform/canonicalize_entry_point_io.cc
+++ b/src/transform/canonicalize_entry_point_io.cc
@@ -32,6 +32,10 @@
   ProgramBuilder out;
   CloneContext ctx(&out, in);
 
+  // Start by cloning all the symbols. This ensures that the authored symbols
+  // won't get renamed if they collide with new symbols below.
+  ctx.CloneSymbols();
+
   // Strip entry point IO decorations from struct declarations.
   // TODO(jrprice): This code is duplicated with the SPIR-V transform.
   for (auto* ty : ctx.src->AST().ConstructedTypes()) {
diff --git a/src/transform/canonicalize_entry_point_io_test.cc b/src/transform/canonicalize_entry_point_io_test.cc
index a7e4bf7..aadf916 100644
--- a/src/transform/canonicalize_entry_point_io_test.cc
+++ b/src/transform/canonicalize_entry_point_io_test.cc
@@ -503,6 +503,29 @@
   EXPECT_EQ(expect, str(got));
 }
 
+TEST_F(CanonicalizeEntryPointIOTest, DontRenameSymbols) {
+  auto* src = R"(
+[[stage(fragment)]]
+fn tint_symbol_1([[location(0)]] col : f32) {
+}
+)";
+
+  auto* expect = R"(
+struct tint_symbol_2 {
+  [[location(0)]]
+  col : f32;
+};
+
+[[stage(fragment)]]
+fn tint_symbol_1(tint_symbol : tint_symbol_2) {
+}
+)";
+
+  auto got = Run<CanonicalizeEntryPointIO>(src);
+
+  EXPECT_EQ(expect, str(got));
+}
+
 }  // namespace
 }  // namespace transform
 }  // namespace tint