diff --git a/src/3rdparty/zlib/gzguts.h b/src/3rdparty/zlib/gzguts.h
index c752b5763b6..26b4d37c1d2 100644
--- a/src/3rdparty/zlib/gzguts.h
+++ b/src/3rdparty/zlib/gzguts.h
@@ -32,7 +32,10 @@
 #  include <limits.h>
 #endif
 #if !defined(_WIN32_WCE)
-#include <fcntl.h>
+#  include <fcntl.h>
+#else
+# include <qglobal.h>
+# include <qfunctions_wince.h>
 #endif
 
 #ifdef NO_DEFLATE       /* for compatibility with old definition */
@@ -40,7 +43,9 @@
 #endif
 
 #ifdef _MSC_VER
-#  include <io.h>
+#  if !defined(_WIN32_WCE)
+#    include <io.h>
+#  endif
 #  define vsnprintf _vsnprintf
 #endif
 
diff --git a/src/3rdparty/zlib/zutil.c b/src/3rdparty/zlib/zutil.c
index 898ed345b0e..3418c5999fd 100644
--- a/src/3rdparty/zlib/zutil.c
+++ b/src/3rdparty/zlib/zutil.c
@@ -136,14 +136,6 @@ const char * ZEXPORT zError(err)
     return ERR_MSG(err);
 }
 
-#if defined(_WIN32_WCE)
-    /* The Microsoft C Run-Time Library for Windows CE doesn't have
-     * errno.  We define it as a global variable to simplify porting.
-     * Its value is always 0 and should not be used.
-     */
-    int errno = 0;
-#endif
-
 #ifndef HAVE_MEMCPY
 
 void ZLIB_INTERNAL zmemcpy(dest, source, len)
diff --git a/src/corelib/kernel/qfunctions_wince.h b/src/corelib/kernel/qfunctions_wince.h
index f83dad0dde6..7cd8ea66a22 100644
--- a/src/corelib/kernel/qfunctions_wince.h
+++ b/src/corelib/kernel/qfunctions_wince.h
@@ -182,6 +182,16 @@ void    qt_wince_rewind( FILE *stream );
 int     qt_wince___fileno(FILE *);
 FILE   *qt_wince_tmpfile( void );
 
+//For zlib we need these helper functions, but they break the build when
+//set globally, so just set them for zlib use
+#ifdef ZLIB_H
+#define open qt_wince_open
+#define close qt_wince__close
+#define lseek qt_wince__lseek
+#define read qt_wince__read
+#define write qt_wince__write
+#endif
+
 int qt_wince__mkdir(const char *dirname);
 int qt_wince__rmdir(const char *dirname);
 int qt_wince__access( const char *path, int pmode );