diff --git a/Makefile.base.mk b/Makefile.base.mk
index 9f4c3f6e..b0aaee81 100644
--- a/Makefile.base.mk
+++ b/Makefile.base.mk
@@ -263,7 +263,7 @@ endif
 HAVE_LIBLO = $(shell $(PKG_CONFIG) --exists liblo && echo true)
 
 ifeq ($(SKIP_RTAUDIO_FALLBACK),true)
-CXXFLAGS += DPF_JACK_STANDALONE_SKIP_RTAUDIO_FALLBACK
+CXXFLAGS += -DDPF_JACK_STANDALONE_SKIP_RTAUDIO_FALLBACK
 else
 ifeq ($(MACOS),true)
 HAVE_RTAUDIO    = true