diff --git a/src/vtk6-1-tryrun.patch b/src/vtk6-1-tryrun.patch
index 3a77de24..fb1ee19d 100644
--- a/src/vtk6-1-tryrun.patch
+++ b/src/vtk6-1-tryrun.patch
@@ -19,7 +19,7 @@
 +     CACHE STRING "Output from TRY_RUN" FORCE)
 +
 +SET( CMAKE_REQUIRE_LARGE_FILE_SUPPORT
-+     ""
++     "0"
 +     CACHE STRING "Result from TRY_RUN" FORCE)
 +
 +SET( CMAKE_REQUIRE_LARGE_FILE_SUPPORT__TRYRUN_OUTPUT