diff --git a/src/misc/alloc.c b/src/misc/alloc.c
index d712464c0..257e7341c 100644
--- a/src/misc/alloc.c
+++ b/src/misc/alloc.c
@@ -143,7 +143,7 @@ trealloc(void *ptr, size_t num)
    Function is used in outitf.c to prevent heap fragmentation 
    An additional heap outheap is used to store the plot output data.
 */
-#ifdef HAS_WINDOWS
+#if defined(HAS_WINDOWS) || defined(HAS_TCLWIN)
 #if defined(_MSC_VER) || defined(__MINGW32__)
 void *
 hrealloc(void *ptr, size_t num)