diff --git a/libc/arch-arm64/dynamic_function_dispatch.cpp b/libc/arch-arm64/dynamic_function_dispatch.cpp
index 0edc7f7..cd55311 100644
--- a/libc/arch-arm64/dynamic_function_dispatch.cpp
+++ b/libc/arch-arm64/dynamic_function_dispatch.cpp
@@ -41,6 +41,12 @@
     }
 }
 
+typedef void* memcmp_func(void*, const void*, size_t);
+DEFINE_IFUNC_FOR(memcmp) {
+    // TODO: enable the SVE version.
+    RETURN_FUNC(memcmp_func, __memcmp_aarch64);
+}
+
 typedef void* memcpy_func(void*, const void*, size_t);
 DEFINE_IFUNC_FOR(memcpy) {
     if (arg->_hwcap & HWCAP_ASIMD) {
@@ -110,6 +116,12 @@
     RETURN_FUNC(strncmp_func, __strncmp_aarch64);
 }
 
+typedef size_t strnlen_func(const char*);
+DEFINE_IFUNC_FOR(strnlen) {
+    // TODO: enable the SVE version.
+    RETURN_FUNC(strnlen_func, __strnlen_aarch64);
+}
+
 typedef char* strrchr_func(const char*, int);
 DEFINE_IFUNC_FOR(strrchr) {
     if (arg->_hwcap2 & HWCAP2_MTE) {