diff --git a/packaging/3rdParty-devel/CMakeLists.txt b/packaging/3rdParty-devel/CMakeLists.txt
index 58e6bdb8..8409e6d3 100644
--- a/packaging/3rdParty-devel/CMakeLists.txt
+++ b/packaging/3rdParty-devel/CMakeLists.txt
@@ -409,7 +409,7 @@ else(OPTION_EXPAT)
 endif(OPTION_EXPAT)
 
 if(OPTION_PNG)
-   set(PNG_ARGS ${EXTERNALS_CMAKE_ARGS} -DPNG_SHARED=off -DPNG_TESTS=off -DCMAKE_DEBUG_POSTFIX='')
+   set(PNG_ARGS ${EXTERNALS_CMAKE_ARGS} -DPNG_SHARED=off -DPNG_TESTS=off)
    ExternalProject_Add(${PNG_PROJECT}
       DOWNLOAD_NAME ${PNG_FILE}
       URL ${PNG_URL}
@@ -553,7 +553,7 @@ else(OPTION_TINYGLTF)
 endif(OPTION_TINYGLTF)
 
 if(OPTION_MINIZIP)
-   set(MINIZIP_ARGS ${EXTERNALS_CMAKE_ARGS} -D CMAKE_DEBUG_POSTFIX= -D BUILD_SHARED_LIBS=on)
+   set(MINIZIP_ARGS ${EXTERNALS_CMAKE_ARGS} -D CMAKE_DEBUG_POSTFIX='')
    ExternalProject_Add(${MINIZIP_PROJECT}
       URL ${MINIZIP_URL}
       URL_HASH ${MINIZIP_HASH}