diff --git a/examples/example_glfw_vulkan/CMakeLists.txt b/examples/example_glfw_vulkan/CMakeLists.txt
index 443a144eae65..75475dbae873 100644
--- a/examples/example_glfw_vulkan/CMakeLists.txt
+++ b/examples/example_glfw_vulkan/CMakeLists.txt
@@ -15,7 +15,9 @@ set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DVK_PROTOTYPES")
 set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DVK_PROTOTYPES")
 
 # GLFW
-set(GLFW_DIR ../../../glfw) # Set this to point to an up-to-date GLFW repo
+if(NOT GLFW_DIR)
+   set(GLFW_DIR ../../../glfw) # Set this to point to an up-to-date GLFW repo
+endif()
 option(GLFW_BUILD_EXAMPLES "Build the GLFW example programs" OFF)
 option(GLFW_BUILD_TESTS "Build the GLFW test programs" OFF)
 option(GLFW_BUILD_DOCS "Build the GLFW documentation" OFF)