diff --git a/repos/libports/lib/mk/spec/arm/gmp-mpn.mk b/repos/libports/lib/mk/spec/arm/gmp-mpn.mk
index fe2d1c274..f3bc7c5e4 100644
--- a/repos/libports/lib/mk/spec/arm/gmp-mpn.mk
+++ b/repos/libports/lib/mk/spec/arm/gmp-mpn.mk
@@ -6,7 +6,7 @@ FILTER_OUT += udiv_w_sdiv.c
 
 # add ARM-specific assembly files and filter out the generic C files if needed
 
-SRC_ASM += copyd.asm copyi.asm
+SRC_ASM += copyd.asm copyi.asm invert_limb.asm
 
 FILTER_OUT += popham.c