diff --git a/toolsrc/include/SourceParagraph.h b/toolsrc/include/SourceParagraph.h
index 9c9439ea7..bac005144 100644
--- a/toolsrc/include/SourceParagraph.h
+++ b/toolsrc/include/SourceParagraph.h
@@ -7,8 +7,6 @@ namespace vcpkg
 {
     struct SourceParagraph
     {
-        static const std::vector<std::string>& get_list_of_valid_fields();
-
         SourceParagraph();
 
         explicit SourceParagraph(std::unordered_map<std::string, std::string> fields);
diff --git a/toolsrc/src/SourceParagraph.cpp b/toolsrc/src/SourceParagraph.cpp
index f46a9c2af..6f25dbded 100644
--- a/toolsrc/src/SourceParagraph.cpp
+++ b/toolsrc/src/SourceParagraph.cpp
@@ -19,7 +19,7 @@ namespace vcpkg
         static const std::string BUILD_DEPENDS = "Build-Depends";
     }
 
-    const std::vector<std::string>& SourceParagraph::get_list_of_valid_fields()
+    static const std::vector<std::string>& get_list_of_valid_fields()
     {
         static const std::vector<std::string> valid_fields =
         {