diff --git a/plugins/Makefile b/plugins/Makefile
index 1fae7f2..bbc2bd6 100644
--- a/plugins/Makefile
+++ b/plugins/Makefile
@@ -1144,10 +1144,12 @@ BASE_FLAGS += -I../src/Rack/dep/oui-blendish
 BASE_FLAGS += -I../src/Rack/dep/pffft
 
 # SSE must always be enabled, even in debug builds
+ifeq ($(CPU_I386_OR_X86_64),true)
 BASE_FLAGS += -msse -msse2 -msse3
 ifeq ($(WASM),true)
 BASE_FLAGS += -msimd128
 endif
+endif
 
 ifeq ($(DEBUG),true)
 BASE_FLAGS += -UDEBUG