diff --git a/src/ast/kill_statement_test.cc b/src/ast/kill_statement_test.cc
index 35e1b378f8..63115c7857 100644
--- a/src/ast/kill_statement_test.cc
+++ b/src/ast/kill_statement_test.cc
@@ -55,4 +55,3 @@ TEST_F(KillStatementTest, ToStr) {
 
 }  // namespace ast
 }  // namespace tint
-
diff --git a/src/ast/location_decoration_test.cc b/src/ast/location_decoration_test.cc
index 78581939d3..c68253ad0e 100644
--- a/src/ast/location_decoration_test.cc
+++ b/src/ast/location_decoration_test.cc
@@ -14,6 +14,8 @@
 
 #include "src/ast/location_decoration.h"
 
+#include <sstream>
+
 #include "gtest/gtest.h"
 
 namespace tint {
@@ -34,5 +36,13 @@ TEST_F(LocationDecorationTest, Is) {
   EXPECT_FALSE(d.IsSet());
 }
 
+TEST_F(LocationDecorationTest, ToStr) {
+  LocationDecoration d{2};
+  std::ostringstream out;
+  d.to_str(out);
+  EXPECT_EQ(out.str(), R"(LocationDecoration{2}
+)");
+}
+
 }  // namespace ast
 }  // namespace tint