diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5b0405f4a..43256fc04 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -88,7 +88,7 @@ else()
   endif()
 
   if(WITH_ZLIB)
-    find_package(zlib REQUIRED)
+    find_package(ZLIB REQUIRED)
     add_definitions(-DZLIB)
     include_directories(${ZLIB_INCLUDE_DIR})
     list(APPEND THIRDPARTY_LIBS ${ZLIB_LIBRARIES})
