diff --git a/cmake/FindOpenCASCADE.cmake b/cmake/FindOpenCASCADE.cmake
index 74268a7b5a..438d2a9873 100644
--- a/cmake/FindOpenCASCADE.cmake
+++ b/cmake/FindOpenCASCADE.cmake
@@ -12,10 +12,6 @@
 UNIFY_ENVVARS_AND_CACHE(OCC_INCLUDE_DIR)
 UNIFY_ENVVARS_AND_CACHE(OCC_LIBRARY_DIR)
 
-# OpenCASCADE may be built with VTK support. Try to find VTK first to avoid
-# CMake errors when OpenCASCADE's config references VTK targets.
-find_package(VTK QUIET)
-
 if(OCC_INCLUDE_DIR)
     set(OCC_INCLUDE_DIR ${OCC_INCLUDE_DIR} CACHE FILEPATH "Open CASCADE header files")
     message(STATUS "Looking for Open CASCADE include files in: ${OCC_INCLUDE_DIR}")
@@ -33,6 +29,11 @@ if(NOT OCC_INCLUDE_DIR AND NOT OCC_LIBRARY_DIR)
     # find_package creates variables:
     # - `OpenCASCADE_INCLUDE_DIR`
     # - `OpenCASCADE_LIBRARIES`
+
+    # OpenCASCADE may be built with VTK support. Try to find VTK first to avoid
+    # CMake errors when OpenCASCADE's config references VTK targets.
+    find_package(VTK QUIET)
+
     find_package(OpenCASCADE CONFIG REQUIRED)
     return()
 endif()