diff --git a/lisp/Config.sun4_solaris_sunc b/lisp/Config.sun4_solaris_sunc
index b8501223094abaf0e159cb9a453c2c4f9f5ef47d..427d9825d19656ddeb1dd76381116628b962ae19 100644
--- a/lisp/Config.sun4_solaris_sunc
+++ b/lisp/Config.sun4_solaris_sunc
@@ -58,7 +58,7 @@ ARCH_SRC = sparc-arch.c
 
 DEPEND=$(CC) 
 DEPEND_FLAGS = -xM
-OS_SRC = solaris-os.c os-common.c undefineds.c elf.c
+OS_SRC = solaris-os.c os-common.c undefineds.c elf.c k_rem_pio2.c
 OS_LINK_FLAGS=
 OS_LIBS= -lsocket -lnsl -ldl