diff --git a/Makefile b/Makefile
index 7476a9dc312d..cff68b657030 100644
--- a/Makefile
+++ b/Makefile
@@ -299,6 +299,7 @@ $(C_BUILDDIR)/librfu_intr.o: CC1 := tools/agbcc/bin/agbcc_arm$(EXE)
 $(C_BUILDDIR)/librfu_intr.o: CFLAGS := -O2 -mthumb-interwork -quiet
 else
 $(C_BUILDDIR)/librfu_intr.o: CFLAGS := -mthumb-interwork -O2 -mabi=apcs-gnu -mtune=arm7tdmi -march=armv4t -fno-toplevel-reorder -Wno-pointer-to-int-cast
+$(C_BUILDDIR)/math_util.o: CFLAGS := -mthumb-interwork -O2 -mabi=apcs-gnu -mtune=arm7tdmi -march=armv4t -Wno-pointer-to-int-cast
 endif
 
 ifeq ($(DINFO),1)