diff --git a/tmk_core/common.mk b/tmk_core/common.mk
index 834e0e03aa..5ead3c090f 100644
--- a/tmk_core/common.mk
+++ b/tmk_core/common.mk
@@ -166,6 +166,8 @@ ifeq ($(strip $(LTO_ENABLE)), yes)
     EXTRAFLAGS += -flto
     TMK_COMMON_DEFS += -DLTO_ENABLE
     TMK_COMMON_DEFS += -DLINK_TIME_OPTIMIZATON_ENABLE
+else ifdef LINK_TIME_OPTIMIZATION_ENABLE
+    $(error The LINK_TIME_OPTIMIZATION_ENABLE flag has been renamed to LTO_ENABLE.)
 endif
 
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