diff --git a/reactos/sdk/lib/3rdparty/zlib/CMakeLists.txt b/reactos/sdk/lib/3rdparty/zlib/CMakeLists.txt
index 759aa7f874f..72468cd6856 100644
--- a/reactos/sdk/lib/3rdparty/zlib/CMakeLists.txt
+++ b/reactos/sdk/lib/3rdparty/zlib/CMakeLists.txt
@@ -1,5 +1,5 @@
 
-add_definitions(-DNO_VIZ -DZ_SOLO)
+add_definitions(-DNO_VIZ)
 include_directories(${REACTOS_SOURCE_DIR}/sdk/include/reactos/libs/zlib)
 
 list(APPEND SOURCE
@@ -7,6 +7,10 @@ list(APPEND SOURCE
     compress.c
     crc32.c
     deflate.c
+    gzclose.c
+    gzlib.c
+    gzread.c
+    gzwrite.c
     infback.c
     inffast.c
     inflate.c