diff --git a/src/substrait/textplan/SymbolTable.cpp b/src/substrait/textplan/SymbolTable.cpp
index 78a1e82b..568a531e 100644
--- a/src/substrait/textplan/SymbolTable.cpp
+++ b/src/substrait/textplan/SymbolTable.cpp
@@ -14,7 +14,7 @@
 
 using namespace io::substrait::textplan;
 
-const std::string& symbolTypeName(SymbolType type) {
+const std::string& io::substrait::textplan::symbolTypeName(SymbolType type) {
   static std::vector<std::string> names = {
       "kExtensionSpace",
       "kFunction",