diff --git a/libc/config/linux/aarch64/entrypoints.txt b/libc/config/linux/aarch64/entrypoints.txt
index 0148e76d65380b..81a6217ba680d6 100644
--- a/libc/config/linux/aarch64/entrypoints.txt
+++ b/libc/config/linux/aarch64/entrypoints.txt
@@ -358,6 +358,7 @@ set(TARGET_LIBM_ENTRYPOINTS
 if(LIBC_COMPILER_HAS_FLOAT128)
   list(APPEND TARGET_LIBM_ENTRYPOINTS
     # math.h C23 _Float128 entrypoints
+    libc.src.math.copysignf128
     libc.src.math.fabsf128
   )
 endif()