diff --git a/code/renderergl1/CMakeLists.txt b/code/renderergl1/CMakeLists.txt
index 16e42d9a..bec51e02 100644
--- a/code/renderergl1/CMakeLists.txt
+++ b/code/renderergl1/CMakeLists.txt
@@ -18,6 +18,7 @@ get_target_property(target_type omohrenderergl1 TYPE)
 if (target_type STREQUAL "SHARED_LIBRARY")
 	target_sources(omohrenderergl1 PRIVATE "./tr_subs.c")
 	target_compile_definitions(omohrenderergl1 PUBLIC USE_RENDERER_DLOPEN=1)
+	target_compile_definitions(omohrenderergl1 PRIVATE REF_DLL=1)
 endif ()
 
 set_target_properties(omohrenderergl1 PROPERTIES PREFIX "")
diff --git a/code/renderergl2/CMakeLists.txt b/code/renderergl2/CMakeLists.txt
index f49c3e33..90682de3 100644
--- a/code/renderergl2/CMakeLists.txt
+++ b/code/renderergl2/CMakeLists.txt
@@ -22,6 +22,7 @@ get_target_property(target_type omohrenderergl2 TYPE)
 if (target_type STREQUAL "SHARED_LIBRARY")
 	target_sources(omohrenderergl2 PRIVATE "./tr_subs.c")
 	target_compile_definitions(omohrenderergl2 PUBLIC USE_RENDERER_DLOPEN=1)
+	target_compile_definitions(omohrenderergl2 PRIVATE REF_DLL=1)
 endif ()
 
 set_target_properties(omohrenderergl2 PROPERTIES PREFIX "")