diff --git a/CMakeLists.txt b/CMakeLists.txt
index 74fc7ba35..a62652639 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -13,7 +13,7 @@ find_package(Qt4)
 find_package(Qwt 6)
 find_package(CBF)
 find_package(Doxygen)
-find_package(PNG REQUIRED)
+find_package(PNG 1.6 REQUIRED)
 include_directories(${PNG_INCLUDE_DIR})
 
 if (USE_HDF5)