diff --git a/aegisub/tests/Makefile b/aegisub/tests/Makefile
index fb962af55..ba9415351 100644
--- a/aegisub/tests/Makefile
+++ b/aegisub/tests/Makefile
@@ -7,7 +7,7 @@ LIBS += -L../libaegisub -laegisub-3.0  -lgtest -L../universalchardet -luniversal
 LDFLAGS += -Wl,-rpath $(CURDIR)/../libaegisub $(LDFLAGS_ICONV)
 
 CPPFLAGS += -I../src/include -I../libaegisub/include $(CFLAGS_ICONV)
-CXXFLAGS += -Wno-unused-value
+CXXFLAGS += -Wno-unused-value $(DEBUG_FLAGS)
 
 
 ifdef $(BUILD_DARWIN)