diff --git a/test/testsimplifyusing.cpp b/test/testsimplifyusing.cpp
index 2585547c80c..f1a3ff49a94 100644
--- a/test/testsimplifyusing.cpp
+++ b/test/testsimplifyusing.cpp
@@ -68,6 +68,7 @@ class TestSimplifyUsing : public TestFixture {
         TEST_CASE(simplifyUsing27);
         TEST_CASE(simplifyUsing28);
         TEST_CASE(simplifyUsing29);
+        TEST_CASE(simplifyUsing30);
 
         TEST_CASE(simplifyUsing8970);
         TEST_CASE(simplifyUsing8971);
@@ -682,6 +683,16 @@ class TestSimplifyUsing : public TestFixture {
         ASSERT_EQUALS("", errout.str());
     }
 
+    void simplifyUsing30() { // #8454
+        const char code[] = "using std::to_string;\n"
+                            "void f() {\n"
+                            "    std::string str = to_string(1);\n"
+                            "}\n";
+        const char expected[] = "void f ( ) { std :: string str ; str = std :: to_string ( 1 ) ; }";
+        ASSERT_EQUALS(expected, tok(code, Platform::Type::Native, /*debugwarnings*/ true));
+        ASSERT_EQUALS("", errout.str());
+    }
+
     void simplifyUsing8970() {
         const char code[] = "using V = std::vector<int>;\n"
                             "struct A {\n"