diff --git a/examples/sokol-video-demo/CMakeLists.txt b/examples/sokol-video-demo/CMakeLists.txt
index fb6a6fc..f073d20 100644
--- a/examples/sokol-video-demo/CMakeLists.txt
+++ b/examples/sokol-video-demo/CMakeLists.txt
@@ -40,6 +40,7 @@ if(CMAKE_SYSTEM_NAME STREQUAL Darwin)
 else()
     add_library(sokol STATIC sokol.c ${sokol_HEADERS})
     if (CMAKE_SYSTEM_NAME STREQUAL Linux)
+        target_compile_definitions(sokol PRIVATE SOKOL_GLCORE=1)
         target_link_libraries(sokol INTERFACE X11 Xi Xcursor GL dl m)
     endif()
 endif()