diff --git a/components/nif/nifstream.cpp b/components/nif/nifstream.cpp
index 4ecb0e373..44be4b241 100644
--- a/components/nif/nifstream.cpp
+++ b/components/nif/nifstream.cpp
@@ -38,7 +38,7 @@ namespace Nif
     }
 
     // Convenience utility functions: get the versions of the currently read file
-    unsigned int NIFStream::getVersion() { return file->getVersion(); }
-    unsigned int NIFStream::getUserVersion() { return file->getBethVersion(); }
-    unsigned int NIFStream::getBethVersion()  { return file->getBethVersion(); }
+    unsigned int NIFStream::getVersion() const { return file->getVersion(); }
+    unsigned int NIFStream::getUserVersion() const { return file->getBethVersion(); }
+    unsigned int NIFStream::getBethVersion() const { return file->getBethVersion(); }
 }
diff --git a/components/nif/nifstream.hpp b/components/nif/nifstream.hpp
index 62e334e01..c78377448 100644
--- a/components/nif/nifstream.hpp
+++ b/components/nif/nifstream.hpp
@@ -159,12 +159,12 @@ public:
 
     std::string getString();
 
-    unsigned int getVersion();
-    unsigned int getUserVersion();
-    unsigned int getBethVersion();
+    unsigned int getVersion() const;
+    unsigned int getUserVersion() const;
+    unsigned int getBethVersion() const;
 
     // Convert human-readable version numbers into a number that can be compared.
-    uint32_t generateVersion(uint8_t major, uint8_t minor, uint8_t patch, uint8_t rev)
+    static constexpr uint32_t generateVersion(uint8_t major, uint8_t minor, uint8_t patch, uint8_t rev)
     {
         return (major << 24) + (minor << 16) + (patch << 8) + rev;
     }