diff --git a/libc/arch-arm/generic/generic.mk b/libc/arch-arm/generic/generic.mk
index 358b1e6..18cad9d 100644
--- a/libc/arch-arm/generic/generic.mk
+++ b/libc/arch-arm/generic/generic.mk
@@ -1,3 +1,4 @@
 $(call libc-add-cpu-variant-src,MEMCPY,arch-arm/generic/bionic/memcpy.S)
 $(call libc-add-cpu-variant-src,MEMSET,arch-arm/generic/bionic/memset.S)
 $(call libc-add-cpu-variant-src,STRCMP,arch-arm/generic/bionic/strcmp.S)
+$(call libc-add-cpu-variant-src,STRLEN,arch-arm/generic/bionic/strlen.c)