diff --git a/src/common/file.cpp b/src/common/file.cpp
index 17b5627877..b7ce74c794 100644
--- a/src/common/file.cpp
+++ b/src/common/file.cpp
@@ -61,7 +61,6 @@
     #endif
 #elif defined(__DOS__) && defined(__WATCOMC__)
     #include <io.h>
-    char* mktemp(char *path) { return _mktemp(path); }
 #elif (defined(__WXPM__))
     #include <io.h>
     #define   W_OK        2