diff --git a/libs/libm/libmcs/Make.defs b/libs/libm/libmcs/Make.defs
index 71c0f51a71..91fc6d11ed 100644
--- a/libs/libm/libmcs/Make.defs
+++ b/libs/libm/libmcs/Make.defs
@@ -76,6 +76,7 @@ CSRCS = signgam.c \
         expm1d.c \
         fabsd.c \
         fdimd.c \
+        fenv.c \
         floord.c \
         fmad.c \
         fmaxd.c \