diff --git a/itk-module.cmake b/itk-module.cmake
index a085f03a9..1cf9d7954 100644
--- a/itk-module.cmake
+++ b/itk-module.cmake
@@ -5,6 +5,7 @@ set(DOCUMENTATION "")
 set(RTK_IO_DEPENDS
   ITKIOCSV
   ITKIOGDCM
+  ITKGDCM
   ITKIOMeta
   ITKIORAW
   ITKIOTIFF