diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 9794b0f..b683029 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -4,7 +4,7 @@ on:
   push:
 
 env:
-  CACHE_VERSION: 38
+  CACHE_VERSION: 39
   CARDINAL_UNDER_WINE: 1
   EMSCRIPTEN_VERSION: 3.1.27
   DEBIAN_FRONTEND: noninteractive
diff --git a/src/Makefile b/src/Makefile
index 170ebc2..a3a1f20 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -62,6 +62,11 @@ BASE_FLAGS += -IRack/dep/osdialog
 BASE_FLAGS += -IRack/dep/oui-blendish
 BASE_FLAGS += -IRack/dep/pffft
 
+ifeq ($(CPU_I386),true)
+# needed for enabling SSE in pffft
+BASE_FLAGS += -Di386
+endif
+
 ifeq ($(DEBUG),true)
 BASE_FLAGS += -UDEBUG
 ifeq ($(WASM),true)