diff --git a/src/analysis/scoping_analysis.cpp b/src/analysis/scoping_analysis.cpp
index 5fe6d123e..d70dd3c21 100644
--- a/src/analysis/scoping_analysis.cpp
+++ b/src/analysis/scoping_analysis.cpp
@@ -108,10 +108,6 @@ static InternedString mangleName(InternedString id, llvm::StringRef private_name
     return rtn;
 }
 
-static bool isCompilerCreatedName(llvm::StringRef name) {
-    return name[0] == '!' || name[0] == '#';
-}
-
 class ModuleScopeInfo : public ScopeInfo {
 public:
     ScopeInfo* getParent() override { return NULL; }
@@ -121,7 +117,7 @@ class ModuleScopeInfo : public ScopeInfo {
     bool passesThroughClosure() override { return false; }
 
     VarScopeType getScopeTypeOfName(InternedString name) override {
-        if (isCompilerCreatedName(name))
+        if (name.isCompilerCreatedName())
             return VarScopeType::FAST;
         else
             return VarScopeType::GLOBAL;
@@ -185,7 +181,7 @@ class EvalExprScopeInfo : public ScopeInfo {
     bool passesThroughClosure() override { return false; }
 
     VarScopeType getScopeTypeOfName(InternedString name) override {
-        if (isCompilerCreatedName(name))
+        if (name.isCompilerCreatedName())
             return VarScopeType::FAST;
         else if (forced_globals.find(name) != forced_globals.end())
             return VarScopeType::GLOBAL;
@@ -341,7 +337,7 @@ class ScopeInfoBase : public ScopeInfo {
     bool passesThroughClosure() override { return usage->passthrough_accesses.size() > 0 && !createsClosure(); }
 
     VarScopeType getScopeTypeOfName(InternedString name) override {
-        if (isCompilerCreatedName(name))
+        if (name.isCompilerCreatedName())
             return VarScopeType::FAST;
 
         if (usage->forced_globals.count(name) > 0)
diff --git a/src/core/stringpool.cpp b/src/core/stringpool.cpp
index 997c4f262..2642afce6 100644
--- a/src/core/stringpool.cpp
+++ b/src/core/stringpool.cpp
@@ -36,4 +36,10 @@ llvm::StringRef InternedString::s() const {
 const char* InternedString::c_str() const {
     return _str->c_str();
 }
+
+bool InternedString::isCompilerCreatedName() const {
+    char c = _str->s()[0];
+    return c == '!' || c == '#';
+}
+
 }
diff --git a/src/core/stringpool.h b/src/core/stringpool.h
index 3a2caac57..b7358930b 100644
--- a/src/core/stringpool.h
+++ b/src/core/stringpool.h
@@ -82,6 +82,8 @@ class InternedString {
     operator llvm::StringRef() const { return s(); }
     operator BoxedString*() const { return getBox(); }
 
+    bool isCompilerCreatedName() const;
+
     friend class InternedStringPool;
     friend struct std::hash<InternedString>;
     friend struct std::less<InternedString>;