diff --git a/src/common/utilscmn.cpp b/src/common/utilscmn.cpp
index 9bc2b497f7..6020b8780d 100644
--- a/src/common/utilscmn.cpp
+++ b/src/common/utilscmn.cpp
@@ -60,32 +60,6 @@
 
 #if !defined(__WATCOMC__)
     #if !(defined(_MSC_VER) && (_MSC_VER > 800))
-        //
-        // OS/2's App.h is being included first which includes nerrno.h
-        // so these are already defined.  Undef them if defined before
-        // including errno.h
-        //
-        #ifdef EEXIST
-        #undef EEXIST
-        #endif
-        #ifdef ENOENT
-        #undef ENOENT
-        #endif
-        #ifdef EMFILE
-        #undef EMFILE
-        #endif
-        #ifdef EINTR
-        #undef EINTR
-        #endif
-        #ifdef EINVAL
-        #undef EINVAL
-        #endif
-        #ifdef ENOMEM
-        #undef ENOMEM
-        #endif
-        #ifdef EACCES
-        #undef EACCES
-        #endif
         #include <errno.h>
     #endif
 #endif