diff --git a/source/Makefile.deps.mk b/source/Makefile.deps.mk
index 331884b72..0c64d6a8d 100644
--- a/source/Makefile.deps.mk
+++ b/source/Makefile.deps.mk
@@ -81,6 +81,9 @@ ifneq (,$(filter aarch64%,$(TARGET_PROCESSOR)))
 CPU_AARCH64 = true
 CPU_ARM_OR_AARCH64 = true
 endif
+ifneq (,$(filter riscv64%,$(TARGET_PROCESSOR)))
+CPU_RISCV64 = true
+endif
 
 # ---------------------------------------------------------------------------------------------------------------------
 # Set PKG_CONFIG (can be overridden by environment variable)
diff --git a/source/modules/ysfx/Makefile b/source/modules/ysfx/Makefile
index b8b910c51..d004702bd 100644
--- a/source/modules/ysfx/Makefile
+++ b/source/modules/ysfx/Makefile
@@ -44,6 +44,11 @@ YSFX_FLAGS += -pthread
 endif
 endif
 
+ifeq ($(CPU_RISCV64),true)
+# FIXME
+YSFX_FLAGS += -DEEL_TARGET_PORTABLE
+endif
+
 ifeq ($(WASM),true)
 # FIXME
 YSFX_FLAGS += -DEEL_TARGET_PORTABLE