diff --git a/Modules/Dart.cmake b/Modules/Dart.cmake
index 70d33a042f..a17fc307b7 100644
--- a/Modules/Dart.cmake
+++ b/Modules/Dart.cmake
@@ -35,6 +35,7 @@ IF(BUILD_TESTING)
   FIND_PROGRAM(COMPRESSIONCOMMAND NAMES gzip compress zip )
   FIND_PROGRAM(GUNZIPCOMMAND gunzip )
   FIND_PROGRAM(JAVACOMMAND java )
+  FIND_PROGRAM(PURIFYCOMMAND purify )
 
   # find a tcl shell command
   IF (UNIX)