diff --git a/src/fileio.cpp b/src/fileio.cpp
index 858ac5abba..6658955a95 100644
--- a/src/fileio.cpp
+++ b/src/fileio.cpp
@@ -436,7 +436,7 @@ void FioCreateDirectory(const char *name)
  * @param buf    string to append the separator to
  * @param buflen the length of the buf
  */
-static void AppendPathSeparator(char *buf, size_t buflen)
+void AppendPathSeparator(char *buf, size_t buflen)
 {
 	size_t s = strlen(buf);
 
diff --git a/src/fileio_func.h b/src/fileio_func.h
index 4b42e4908a..b2d2da8032 100644
--- a/src/fileio_func.h
+++ b/src/fileio_func.h
@@ -57,6 +57,7 @@ char *FioAppendDirectory(char *buf, size_t buflen, Searchpath sp, Subdirectory s
 char *FioGetDirectory(char *buf, size_t buflen, Subdirectory subdir);
 
 void SanitizeFilename(char *filename);
+void AppendPathSeparator(char *buf, size_t buflen);
 void DeterminePaths(const char *exe);
 void *ReadFileToMem(const char *filename, size_t *lenp, size_t maxsize);
 bool FileExists(const char *filename);