diff --git a/src/vim.h b/src/vim.h
index 3ee12bf..a72e655 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -1983,7 +1983,7 @@
 /* values for vim_handle_signal() that are not a signal */
 #define SIGNAL_BLOCK	-1
 #define SIGNAL_UNBLOCK  -2
-#if !defined(UNIX) && !defined(VMS)
+#if !defined(UNIX) && !defined(VMS) && !defined(OS2)
 # define vim_handle_signal(x) 0
 #endif