diff --git a/aegisub/src/Makefile b/aegisub/src/Makefile
index 1951d42ad..a3290337e 100644
--- a/aegisub/src/Makefile
+++ b/aegisub/src/Makefile
@@ -81,6 +81,7 @@ endif
 ###########
 ifeq (yes, $(HAVE_LIBASS))
 subtitles_provider_libass.o: CXXFLAGS += $(CFLAGS_LIBASS)
+subtitles_provider.o: CXXFLAGS += $(CFLAGS_LIBASS)
 LIBS += $(LIBS_LIBASS)
 SRC += subtitles_provider_libass.cpp
 else