diff --git a/CMakeModules/Find3rdPartyDependencies.cmake b/CMakeModules/Find3rdPartyDependencies.cmake
index eb5eb5515..1a002bdb7 100644
--- a/CMakeModules/Find3rdPartyDependencies.cmake
+++ b/CMakeModules/Find3rdPartyDependencies.cmake
@@ -68,9 +68,9 @@ MACRO(SEARCH_3RDPARTY OSG_3RDPARTY_BIN)
             MARK_AS_ADVANCED(GLUT_glut_LIBRARY)
         ENDIF(GLUT_FOUND)
         FIND_DEPENDENCY(GIFLIB gif_lib.h "ungif;libungif" ${OSG_3RDPARTY_BIN} "D")
-        FIND_DEPENDENCY(ZLIB zlib.h "z;zlib" ${OSG_3RDPARTY_BIN} "D")
+        FIND_DEPENDENCY(ZLIB zlib.h "z;zlib;zlib1" ${OSG_3RDPARTY_BIN} "D")
         IF(ZLIB_FOUND)
-            FIND_DEPENDENCY(PNG png.h libpng ${OSG_3RDPARTY_BIN} "D")
+            FIND_DEPENDENCY(PNG png.h "libpng;libpng13" ${OSG_3RDPARTY_BIN} "D")
             IF(PNG_FOUND)
                 #forcing subsequent FindPNG stuff to not search for other variables.... kind of a hack 
                 SET(PNG_PNG_INCLUDE_DIR ${PNG_INCLUDE_DIR} CACHE FILEPATH "")