diff --git a/o3tl/Module_o3tl.mk b/o3tl/Module_o3tl.mk
index fa1516bca436..66f7d7a1cda2 100644
--- a/o3tl/Module_o3tl.mk
+++ b/o3tl/Module_o3tl.mk
@@ -23,8 +23,9 @@ $(eval $(call gb_Module_add_targets,o3tl,\
 
 $(eval $(call gb_Module_add_check_targets,o3tl,\
 	CppunitTest_o3tl_tests \
-	$(if $(COM_IS_CLANG),CompilerTest_o3tl_temporary) \
-	$(if $(COM_IS_CLANG),CompilerTest_o3tl_unsafe_downcast) \
+	$(if $(COM_IS_CLANG),$(if $(COMPILER_EXTERNAL_TOOL)$(COMPILER_PLUGIN_TOOL),, \
+	    CompilerTest_o3tl_temporary \
+	    CompilerTest_o3tl_unsafe_downcast)) \
 ))
 
 # vim: set noet sw=4: