diff --git a/Modules/ThirdParty/NrrdIO/src/NrrdIO/CMakeLists.txt b/Modules/ThirdParty/NrrdIO/src/NrrdIO/CMakeLists.txt
index 6c706f096a9..3039e426de5 100644
--- a/Modules/ThirdParty/NrrdIO/src/NrrdIO/CMakeLists.txt
+++ b/Modules/ThirdParty/NrrdIO/src/NrrdIO/CMakeLists.txt
@@ -64,7 +64,12 @@ ENDIF(QNANHIBIT)
 ADD_DEFINITIONS(-DTEEM_ZLIB=1)
 
 ADD_LIBRARY(ITKNrrdIO ${nrrdio_SRCS} )
-TARGET_LINK_LIBRARIES(ITKNrrdIO ${ITKZLIB_LIBRARIES})
+
+IF(UNIX)
+  TARGET_LINK_LIBRARIES(ITKNrrdIO ${ITKZLIB_LIBRARIES} m)
+ELSE(UNIX)
+  TARGET_LINK_LIBRARIES(ITKNrrdIO ${ITKZLIB_LIBRARIES})
+ENDIF(UNIX)
 
 IF(ITK_LIBRARY_PROPERTIES)
   SET_TARGET_PROPERTIES(ITKNrrdIO PROPERTIES ${ITK_LIBRARY_PROPERTIES})