diff --git a/Modules/FindZLIB.cmake b/Modules/FindZLIB.cmake
index 499ae776c..b437e6b87 100644
--- a/Modules/FindZLIB.cmake
+++ b/Modules/FindZLIB.cmake
@@ -36,7 +36,7 @@ FIND_LIBRARY(ZLIB_LIBRARY
 )
 MARK_AS_ADVANCED(ZLIB_LIBRARY ZLIB_INCLUDE_DIR)
 
-IF (ZLIB_INCLUDE_DIR)
+IF (ZLIB_INCLUDE_DIR AND EXISTS "${ZLIB_INCLUDE_DIR}/zlib.h")
     FILE(READ "${ZLIB_INCLUDE_DIR}/zlib.h" ZLIB_H)
     STRING(REGEX REPLACE ".*#define ZLIB_VERSION \"([0-9]+)\\.([0-9]+)\\.([0-9]+)\".*" "\\1.\\2.\\3" ZLIB_VERSION_STRING "${ZLIB_H}")
 ENDIF()