diff --git a/Makefile b/Makefile
index 8d59a79..bfe7539 100644
--- a/Makefile
+++ b/Makefile
@@ -63,6 +63,8 @@ endif
 
 CC = tools/ido_recomp/$(HOST_OS)/7.1/cc
 CC_OLD = tools/ido_recomp/$(HOST_OS)/5.3/cc
+ASMPROC = python3 tools/asmproc/build.py
+ASMPROC_FLAGS :=
 
 MIPS_VERSION := -mips2
 
@@ -214,6 +216,10 @@ CFLAGS  = -G 0 -non_shared -Xfullwarn -Xcpluscomm -Iinclude -Iinclude/PR -Iinclu
 
 LDFLAGS = -T undefined_syms.txt -T undefined_syms_auto.txt -T undefined_funcs_auto.txt -T $(BUILD_DIR)/$(LD_SCRIPT) -Map $(BUILD_DIR)/$(TARGET).map --no-check-sections
 
+
+# run ASM-processor on non-libultra source files
+build/src/%.c.o: CC := $(ASMPROC) $(ASMPROC_FLAGS) $(CC) -- $(AS) $(ASFLAGS) --
+
 ######################## Build #############################
 
 default: all