diff --git a/Fir/Makefile b/Fir/Makefile
index 3d6dce8..0ea0f6a 100644
--- a/Fir/Makefile
+++ b/Fir/Makefile
@@ -5,5 +5,6 @@ NAME := Fir
 GCC_SRCS := $(LIBSRC_PATH)/fir/fir2.c
 
 INCLUDES += -I $(LIBSRC_PATH)
+DEFINES := -Dradio_float_t=float -Dfir_float_t=float
 
 include $(MAKE_HOME)/compile.mk