diff --git a/src/vim.h b/src/vim.h
index 11b9119..ac3a883 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -1682,7 +1682,7 @@
 # endif
 #endif
 
-#if defined(UNIX) || defined(FEAT_GUI) || defined(OS2) || defined(VMS) \
+#if defined(UNIX) || defined(FEAT_GUI) || defined(VMS) \
 	|| defined(FEAT_CLIENTSERVER)
 # define USE_INPUT_BUF
 #endif
@@ -2237,7 +2237,7 @@
 /* values for vim_handle_signal() that are not a signal */
 #define SIGNAL_BLOCK	-1
 #define SIGNAL_UNBLOCK  -2
-#if !defined(UNIX) && !defined(VMS) && !defined(OS2)
+#if !defined(UNIX) && !defined(VMS)
 # define vim_handle_signal(x) 0
 #endif