diff --git a/scintilla/win32/scintilla.mak b/scintilla/win32/scintilla.mak
index 7d1392288d9d..f0ed869c00ff 100644
--- a/scintilla/win32/scintilla.mak
+++ b/scintilla/win32/scintilla.mak
@@ -112,7 +112,7 @@ SRC_OBJS=\
 
 
 # To have PCRE boost regex with header only is integrated and not just the one from std
-#!INCLUDE ../../boostregex/nppSpecifics.mak
+!INCLUDE ../../boostregex/nppSpecifics.mak
 
 COMPONENT_OBJS = \
 	$(DIR_O)\HanjaDic.obj \