diff --git a/src/3rdparty/zlib.pri b/src/3rdparty/zlib.pri
index a7073d5c3a..868d1c71bb 100644
--- a/src/3rdparty/zlib.pri
+++ b/src/3rdparty/zlib.pri
@@ -1,5 +1,5 @@
 wince*: DEFINES += NO_ERRNO_H
-INCLUDEPATH += $$PWD/zlib
+INCLUDEPATH = $$PWD/zlib $$INCLUDEPATH
 SOURCES+= \
     $$PWD/zlib/adler32.c \
     $$PWD/zlib/compress.c \
diff --git a/src/corelib/tools/qbytearray.cpp b/src/corelib/tools/qbytearray.cpp
index d8b2efbef3..a3c1cc3907 100644
--- a/src/corelib/tools/qbytearray.cpp
+++ b/src/corelib/tools/qbytearray.cpp
@@ -43,6 +43,7 @@
 #include <qmath.h>
 
 #ifndef QT_NO_COMPRESS
+#include <zconf.h>
 #include <zlib.h>
 #endif
 #include <ctype.h>