diff --git a/src/Synth_Dexed.mk b/src/Synth_Dexed.mk
index 67d31b4..b68bf9c 100644
--- a/src/Synth_Dexed.mk
+++ b/src/Synth_Dexed.mk
@@ -35,8 +35,8 @@ INCLUDE += -I $(CMSIS_DSP_INCLUDE_DIR)
 INCLUDE += -I $(CMSIS_DSP_PRIVATE_INCLUDE_DIR)
 INCLUDE += -I $(CMSIS_DSP_COMPUTELIB_INCLUDE_DIR)
 
-DEFINE += -DARM_MATH_NEON
 ifeq ($(strip $(AARCH)),64)
+DEFINE += -DARM_MATH_NEON
 DEFINE += -DHAVE_NEON
 endif