diff --git a/desktop_version/src/FileSystemUtils.cpp b/desktop_version/src/FileSystemUtils.cpp
index 1c24c266..fdd79a35 100644
--- a/desktop_version/src/FileSystemUtils.cpp
+++ b/desktop_version/src/FileSystemUtils.cpp
@@ -213,7 +213,7 @@ static bool FILESYSTEM_exists(const char *fname)
 	return PHYSFS_exists(fname);
 }
 
-void FILESYSTEM_mount(const char *fname)
+static void FILESYSTEM_mount(const char *fname)
 {
 	const char* real_dir = PHYSFS_getRealDir(fname);
 	const char* dir_separator;
diff --git a/desktop_version/src/FileSystemUtils.h b/desktop_version/src/FileSystemUtils.h
index fd6b6d81..5efcdc2c 100644
--- a/desktop_version/src/FileSystemUtils.h
+++ b/desktop_version/src/FileSystemUtils.h
@@ -15,7 +15,6 @@ char *FILESYSTEM_getUserLevelDirectory(void);
 bool FILESYSTEM_isFile(const char* filename);
 bool FILESYSTEM_isMounted(const char* filename);
 
-void FILESYSTEM_mount(const char *fname);
 void FILESYSTEM_loadZip(const char* filename);
 void FILESYSTEM_mountassets(const char *path);
 void FILESYSTEM_unmountassets(void);