diff --git a/stepmania/src/RageUtil.cpp b/stepmania/src/RageUtil.cpp
index 4ab7b549d7..a9d9ad263a 100644
--- a/stepmania/src/RageUtil.cpp
+++ b/stepmania/src/RageUtil.cpp
@@ -308,6 +308,14 @@ void splitrelpath( const CString &Path, CString& Dir, CString& FName, CString& E
 	}
 }
 
+CString GetExtension( CString sPath )
+{
+	CString Dir, FName, Ext;
+	splitrelpath( sPath, Dir, FName, Ext );
+	Ext.MakeLower();
+	return Ext;
+}
+
 /* mkdir -p.  Doesn't fail if Path already exists and is a directory. */
 bool CreateDirectories( CString Path )
 {
diff --git a/stepmania/src/RageUtil.h b/stepmania/src/RageUtil.h
index 372453feef..19c6874f92 100644
--- a/stepmania/src/RageUtil.h
+++ b/stepmania/src/RageUtil.h
@@ -174,13 +174,7 @@ void splitrelpath(
 	CString& Ext 
 );
 
-inline CString GetExtension( CString sPath )
-{
-	CString Dir, FName, Ext;
-	splitrelpath( sPath, Dir, FName, Ext );
-	Ext.MakeLower();
-	return Ext;
-};
+CString GetExtension( CString sPath );
 
 typedef int longchar;
 extern const wchar_t INVALID_CHAR;